Ryan Lanza was working at his desk at the Ernst & Young when he saw TV news reports that he had killed 30 people at an elementary school in Connecticut. It was the moment that a stunned Ryan realized what his brother Adam might have done. Lanza quickly told his boss: 'I need to go.' He then walked out of his Times Square office, according to a co-worker who spoke to MailOnline on condition of anonymity. Scroll down for video . Custody: Ryan Lanza is taken away by police after they found him at his Hoboken New Jersey home . Mysteries: Police began questioning Ryan Lanza Friday night . Murderer: Adam Lanza who shot dead his mother and then went on a gun rampage at Sandy Hook elementary school in Connecticut leaving 26 dead . Thirty minutes later, New York police officers stormed the office. Between leaving his place of work and being taken in for questioning, Lanza defended himself in a series of bizarre Facebook posts when he was mistakenly named as the killer after his ID was found at the scene. Lanza, 24, seemed unaware that his younger brother, Adam Lanza, had gunned down 20 children and six adults at Sandy . Hook Elementary School, in Newtown before taking his own life. 'Everyone shut the f*** up it wasn't me,' he insisted on his Facebook page on Friday. 'I'm on the bus home now it wasn't me. IT WASN'T ME I WAS AT . WORK IT WASN'T ME.' Brett Wilshe, a friend of Ryan Lanza's, told the AP that he sent Ryan a Facebook message Friday asking what was going on and if he was alright. According to Wilshe, Lanza's reply was something along the lines of: 'It was my brother. I think my mother is dead. Oh my God.' Questioning: Ryan Lanza is led away for questioning by police after his brother is named as the killer . Adam Lanza attended Newtown High . School, and several local news clippings from recent years mention his . name among the school's honor roll students. A neighbor in Newtown, Rhonda . Cullens, said she knew Nancy Lanza from monthly get-togethers the . neighborhood women had for games of bunco, a dice game. 'She was a very nice lady,' Mrs Cullens said. 'She was just like all the rest of us . in the neighborhood, just a regular person.' Cullens recalled that . Mrs Lanza liked gardening and decorating her house look nice for the holidays. Mrs Cullens said that Mrs Lanza joked that no one noticed because the house was out of view, up a hill. The mix-up . came after an official mistakenly transposed the brothers' first names, . while a New Jersey reporter said Ryan Lanza told him the killer may have . had his ID. He is now being questioned by police in Hoboken, New Jersey, but police said he is not a suspect. Adam Lanza, 20, was dressed in black military gear and a . bullet proof vest when he opened fire in the principal's . office and then moving to a kindergarten classroom where his mother, . Nancy, taught. Sources told the New York Post that . Lanza had 'had a dispute with' his mother, who was found dead at her . home. He then drove to the school in her car and gunned down her kindergarten . class, Fox reported. Lanza died of a self-inflicted gun . wound at the scene. The Newtown Patch reported that he may have been developmentally disabled. Escorted: Ryan Lanza is driven from One Police Plaza in Hoboken, New Jersey . Implicated: There had been confusion over the . identity of the gunman, Adam Lanza, as he was carrying identification . with his brother's name, Ryan Lanza (pictured left and right) Led away: Ryan Lanza has not been named as a suspect but was taken away in handcuffs . Search: Police enter the apartment building in Hoboken, New Jersey where accused Ryan Lanza lives . The Associated Press reported that Lanza's . girlfriend and another friend are missing in New Jersey. His father, Peter Lanza, who was divorced from Nancy, declined to comment at his home in Stamford on Friday when reporters told him about his connection to the shooting. Police surrounded a Hoboken apartment, believed to be the home of Ryan Lanza, on Grand Street on Friday afternoon. According to sources, Adam Lanza drove to the scene of the shootings in his mother's car and opened fire at 9.41am on Friday. Confusion: After police mistakenly identified the killer as Ryan Lanza, he fought back on his Facebook page . Three guns were found at the scene - a . Glock and a Sig Sauer, both pistols - and a .223-caliber rifle. The . rifle was recovered from the back of a car at the school. The two . pistols were recovered from inside the school. The identities of the other victims . have not yet been released but include the school principal, Dawn . Hochsprung, and psychologist. Two of the children died while on the way to hospital. Robert Licata said his six-year-old son was in class when the gunman burst in and shot the teacher. 'That's . when my son grabbed a bunch of his friends and ran out the door,' he . said. 'He was very brave. He waited for his friends.' Horror: Crying children are led from the school where the gunman opened fire on Friday morning . Fears: A woman waits to hear about her sister, a . teacher, following a shooting at Sandy Hook Elementary School. Children . and parents have recounted the terrifying scene inside the buildings . Horror: Young children wait outside the school as police and paramedics swarm the area . Stephen . Delgiadice said his eight-year-old daughter heard two big bangs and . teachers told her to get in a corner. His daughter was fine. 'It's alarming, especially in Newtown, Connecticut, which we always thought was the safest place in America,' he said. A . dispatcher at the Newtown Volunteer Ambulance Corps said a teacher had . been shot in the foot and taken to Danbury Hospital. Andrea Rynn, a . spokeswoman at the hospital, said it had three patients from the school . but she did not have information on the extent or nature of their . injuries. Questions: The killer opened fire in Newtown, Connecticut and his brother is being quizzed in New Jersey . Mergim Bajraliu, 17, heard the gunshots echo from his home and raced to check on his 9-year-old sister at the school. He said his sister, who was fine, heard a scream come over the intercom at one point. He said teachers were shaking and crying as they came out of the building. 'Everyone was just traumatized,' he said. The shooting is the latest in a series . of high-profile gun crimes in American schools and colleges, that is . especially shocking given the age of the students involved. Friday morning Adam Lanza leaves his home in his mother's car after 'shooting her dead' 9.30am Classes begin at Sandy Hook Elementary School . 9.35am First 911 calls that a shooting is underway; police arrive within minutes . 9.40am Shooting underway at the school's main office and a kindergarten class . 9.45am SWAT team arrives; checks building . 10am Reports of deaths begin to trickle out; Obama is briefed . 10.30am Police announce the shooter is dead; later revealed he died from a self-inflicted gun wound . 12.10pm First reports mistakenly naming killer as Ryan Lanza, 24 . 2.47pm President Obama orders flags to fly at half-mast . 1.08pm Reports that the death toll is at 27; at press conference, police say deaths include staff and students . 2pm Authorities announce a body was discovered at killer's Newtown home . 2.40pm Reports of investigation at Ryan Lanza's home in New Jersey; he writes on Facebook that he was not involved and is later led away for questioning . 3.17pm President Obama addresses the nation and struggles to contain his emotions . 5pm Adam Lanza is named as the shooter . 7pm Prayer vigil held at St Rose of Lima Catholic Church in Newtown; hundreds attend, including Connecticut Gov. Dannel Malloy . VIDEO: Ryan Lanza, brother of Connecticut shooter .
Gunman who opened fire at Sandy Hook Elementary School on Friday morning named as Adam Lanza, 20, by police sources .
Lanza died at the scene 'and was carrying brother's ID'
Ryan Lanza works as an accountant at Ernst &Young in the company's Times Square office .
Brother, Ryan Lanza, forced to defend himself on Facebook .
Ryan Lanza was working at his desk at the Ernst & Young when he saw TV news reports that he had killed 30 people at an elementary school in Connecticut. It was the moment that a stunned Ryan realized what his brother Adam might have done. Lanza quickly told his boss: 'I need to go.' He then walked out of his Times Square office, according to a co-worker who spoke to MailOnline on condition of anonymity. Scroll down for video . Custody: Ryan Lanza is taken away by police after they found him at his Hoboken New Jersey home . Mysteries: Police began questioning Ryan Lanza Friday night . Murderer: Adam Lanza who shot dead his mother and then went on a gun rampage at Sandy Hook elementary school in Connecticut leaving 26 dead . Thirty minutes later, New York police officers stormed the office. Between leaving his place of work and being taken in for questioning, Lanza defended himself in a series of bizarre Facebook posts when he was mistakenly named as the killer after his ID was found at the scene. Lanza, 24, seemed unaware that his younger brother, Adam Lanza, had gunned down 20 children and six adults at Sandy . Hook Elementary School, in Newtown before taking his own life. 'Everyone shut the f*** up it wasn't me,' he insisted on his Facebook page on Friday. 'I'm on the bus home now it wasn't me. IT WASN'T ME I WAS AT . WORK IT WASN'T ME.' Brett Wilshe, a friend of Ryan Lanza's, told the AP that he sent Ryan a Facebook message Friday asking what was going on and if he was alright. According to Wilshe, Lanza's reply was something along the lines of: 'It was my brother. I think my mother is dead. Oh my God.' Questioning: Ryan Lanza is led away for questioning by police after his brother is named as the killer . Adam Lanza attended Newtown High . School, and several local news clippings from recent years mention his . name among the school's honor roll students. A neighbor in Newtown, Rhonda . Cullens, said she knew Nancy Lanza from monthly get-togethers the . neighborhood women had for games of bunco, a dice game. 'She was a very nice lady,' Mrs Cullens said. 'She was just like all the rest of us . in the neighborhood, just a regular person.' Cullens recalled that . Mrs Lanza liked gardening and decorating her house look nice for the holidays. Mrs Cullens said that Mrs Lanza joked that no one noticed because the house was out of view, up a hill. The mix-up . came after an official mistakenly transposed the brothers' first names, . while a New Jersey reporter said Ryan Lanza told him the killer may have . had his ID. He is now being questioned by police in Hoboken, New Jersey, but police said he is not a suspect. Adam Lanza, 20, was dressed in black military gear and a . bullet proof vest when he opened fire in the principal's . office and then moving to a kindergarten classroom where his mother, . Nancy, taught. Sources told the New York Post that . Lanza had 'had a dispute with' his mother, who was found dead at her . home. He then drove to the school in her car and gunned down her kindergarten . class, Fox reported. Lanza died of a self-inflicted gun . wound at the scene. The Newtown Patch reported that he may have been developmentally disabled. Escorted: Ryan Lanza is driven from One Police Plaza in Hoboken, New Jersey . Implicated: There had been confusion over the . identity of the gunman, Adam Lanza, as he was carrying identification . with his brother's name, Ryan Lanza (pictured left and right) Led away: Ryan Lanza has not been named as a suspect but was taken away in handcuffs . Search: Police enter the apartment building in Hoboken, New Jersey where accused Ryan Lanza lives . The Associated Press reported that Lanza's . girlfriend and another friend are missing in New Jersey. His father, Peter Lanza, who was divorced from Nancy, declined to comment at his home in Stamford on Friday when reporters told him about his connection to the shooting. Police surrounded a Hoboken apartment, believed to be the home of Ryan Lanza, on Grand Street on Friday afternoon. According to sources, Adam Lanza drove to the scene of the shootings in his mother's car and opened fire at 9.41am on Friday. Confusion: After police mistakenly identified the killer as Ryan Lanza, he fought back on his Facebook page . Three guns were found at the scene - a . Glock and a Sig Sauer, both pistols - and a .223-caliber rifle. The . rifle was recovered from the back of a car at the school. The two . pistols were recovered from inside the school. The identities of the other victims . have not yet been released but include the school principal, Dawn . Hochsprung, and psychologist. Two of the children died while on the way to hospital. Robert Licata said his six-year-old son was in class when the gunman burst in and shot the teacher. 'That's . when my son grabbed a bunch of his friends and ran out the door,' he . said. 'He was very brave. He waited for his friends.' Horror: Crying children are led from the school where the gunman opened fire on Friday morning . Fears: A woman waits to hear about her sister, a . teacher, following a shooting at Sandy Hook Elementary School. Children . and parents have recounted the terrifying scene inside the buildings . Horror: Young children wait outside the school as police and paramedics swarm the area . Stephen . Delgiadice said his eight-year-old daughter heard two big bangs and . teachers told her to get in a corner. His daughter was fine. 'It's alarming, especially in Newtown, Connecticut, which we always thought was the safest place in America,' he said. A . dispatcher at the Newtown Volunteer Ambulance Corps said a teacher had . been shot in the foot and taken to Danbury Hospital. Andrea Rynn, a . spokeswoman at the hospital, said it had three patients from the school . but she did not have information on the extent or nature of their . injuries. Questions: The killer opened fire in Newtown, Connecticut and his brother is being quizzed in New Jersey . Mergim Bajraliu, 17, heard the gunshots echo from his home and raced to check on his 9-year-old sister at the school. He said his sister, who was fine, heard a scream come over the intercom at one point. He said teachers were shaking and crying as they came out of the building. 'Everyone was just traumatized,' he said. The shooting is the latest in a series . of high-profile gun crimes in American schools and colleges, that is . especially shocking given the age of the students involved. Friday morning Adam Lanza leaves his home in his mother's car after 'shooting her dead' 9.30am Classes begin at Sandy Hook Elementary School . 9.35am First 911 calls that a shooting is underway; police arrive within minutes . 9.40am Shooting underway at the school's main office and a kindergarten class . 9.45am SWAT team arrives; checks building . 10am Reports of deaths begin to trickle out; Obama is briefed . 10.30am Police announce the shooter is dead; later revealed he died from a self-inflicted gun wound . 12.10pm First reports mistakenly naming killer as Ryan Lanza, 24 . 2.47pm President Obama orders flags to fly at half-mast . 1.08pm Reports that the death toll is at 27; at press conference, police say deaths include staff and students . 2pm Authorities announce a body was discovered at killer's Newtown home . 2.40pm Reports of investigation at Ryan Lanza's home in New Jersey; he writes on Facebook that he was not involved and is later led away for questioning . 3.17pm President Obama addresses the nation and struggles to contain his emotions . 5pm Adam Lanza is named as the shooter . 7pm Prayer vigil held at St Rose of Lima Catholic Church in Newtown; hundreds attend, including Connecticut Gov. Dannel Malloy . VIDEO: Ryan Lanza, brother of Connecticut shooter .
Ryan Lanza was working at his desk at the Ernst & his ID was found at the scene. Lanza, 24, seemed his brother is named as the killer . Adam Lanza now being questioned by police in Hoboken, New he was carrying identification . with his Friday afternoon. According to sources, Adam mother's car and opened fire at 9.41am on Friday. Sandy Hook Elementary School. Children . and