LONDON , England -LRB- CNN -RRB- -- A jury Tuesday acquitted three men of charges that they helped the bombers who carried out the July 7 , 2005 , attacks on the London transportation system . Sadeer Saleem was accused of helping to plan the July 7 , 2005 bombings in London The four bombers died in the blasts , but Waheed Ali , Sadeer Saleem and Mohammed Shakil were accused of helping them by conducting reconnaissance and conspiring with them . Two of the men -- Ali and Shakil -- were convicted of a second charge of conspiracy to attend a place used for terrorist training . They will be sentenced Wednesday , London 's Metropolitan Police said . Tuesday 's verdicts came at the end of the men 's retrial at Kingston Crown Court in southwest London . A separate jury failed to reach a verdict in their first trial , which ended in August after three months . The bombings in 2005 killed 52 people in blasts on three subway trains and a bus . At least 900 people were wounded . Police arrested the three in March 2007 after piecing together what they called a `` complicated jigsaw with thousands of pieces . '' They were charged in April 2007 . Police said they analyzed more than 4,700 phone numbers and 90,000 calls . They discovered the three men had made a trip to London in December 2004 -- seven months before the fatal bombings -- which prosecutors claimed was a reconnaissance trip to scout potential targets . Prosecutors said that on December 16 , 2004 , the men traveled from the northern English city of Leeds to London , along with Hasib Hussain , one of the July 7 bombers . When they got to the capital , they met with Lindsay . Over the next two days , prosecutors claimed , the men visited tourist sites including the London Eye ferris wheel , the London Aquarium and the Natural History Museum , as well as underground train locations . Some of the spots , prosecutors said , were near where the July 7 bombs were eventually detonated . Police called it `` the first feasibility study '' for the London bombings -- and whether they were looking at tourist or transportation sites , the men were seeking out potential bomb targets , police said . The three men , who always denied the charges , acknowledged making the trip but said it was just an innocent outing to visit Ali 's sister in London . Saleem told the court that he had had `` no idea whatsoever '' about the plot . Traces of DNA linked all three alleged accomplices in some way to the bombers , police had claimed . Investigators found Ali 's fingerprints on evidence found at the bomb-making sites . Khan , Lindsay , Hussain and a fourth bomber , Shehzad Tanweer , set off a series of bombs the morning of July 7 , 2005 . They exploded on underground trains near Liverpool Street , Russell Square and Edgware Road and on a double-decker bus at Tavistock Square . Police have previously said they believe others with knowledge of the attacks remain at large . The jury found that in July 2001 , Ali went with Khan to Pakistan . In July 2003 , Shakil went with Khan to a camp in Pakistan , where the two undertook firearms training with machine guns , rocket-propelled grenade launchers , and AK-47 assault rifles , London police said . The jury found Ali and Shakil guilty of conspiring to attend a place used for terrorist training , knowing or believing that instruction or training would be provided for purposes connected with the commission or preparation of acts of terrorism , London police said . `` Mohammed Siddique Khan and Mohammed Shakil told other attendees that their aim was to fight in Afghanistan , '' said John McDowall , head of the Metropolitan Police Counter Terrorism Command . `` They were proficient in the use of and handling of terrorist weapons , and were certainly not enjoying a day out in a beautiful and mountainous area of Pakistan , as was suggested in court . `` Shakil himself accepted that the camp at Malakand was a serious business , whose purpose was to train willing volunteers to fight and kill in Afghanistan on behalf of the Taliban , a cause to which both he and Ali were , and remain , sympathetic , '' McDowall said .