new delhi delhi polices special cell arrested a scientist identified as bharat bhushan kataria after an exhaustive investigation into the rohini court blast on december 9 police commissioner rakesh asthana revealed at a press conference on saturday the scientist who is currently being interrogated in custody allegedly wanted to eliminate a lawyer with whom he had a longstanding enmitytoi was the first to report on saturday that the blast was not terror related and had been orchestrated by a drdo scientist kataria started planning the attack a month ago and procured the essentials through ecommerce sites and other means which cops are verifying he used an antitheft system meant for bikes as a remote control to trigger the blast he is suspected to have learned the technique online using diy videos and web pages apart from using his professional expertise however the bag used by kataria to carry explosives and his suspicious movements caught on cctv cameras blew his coverthe investigation has revealed that kataria and the advocate amit vashisht were living in the same building till about three years ago they have a longstanding dispute of over 10 years and have filed over a dozen civil and criminal cases against each other one such case against kataria was listed on december 9 at room 102 rohini court for arguments on charge asthana saidkataria who worked with the defence research and development organisation reached the court around 930am and went inside room 102 around 1015am and searched for vashisht he noticed the lawyer sitting in the back row and casually walked to the back he then placed the bag with the ied behind vashisht kataria then walked out and triggered the ied from a safe distance with the remote at 1035 am he walked out of the court complex from the ring road side and went home in his ertiga car police said citing their probe kataria had managed to prepare a powerful nitratebased ied since the circuit was improperly woven only the detonator exploded leaving behind unburnt powder and preventing largescale damage only a cop standing nearby was injured and the targeted lawyer escaped unhurtincriminating material apart from the attire of an advocate used in the incident have been recovered from the residence of the accused said asthana who closely monitored the entire investigationthe lowintensity blast was reported around 1025am a case under sections of attempted murder 307 ipc and section 3 of the explosive substances act was registered at the special cell almost 200 cops comprising dcp rajiv ranjan singh acp ved prakash and others from the northern range began their probe while other units of the cell provided inputs a senior cop saidpreliminary findings of the national security guard and forensic lab indicated the use of easily available materials in fabricating the ied components of the ied including chemicals like nitrate and potassium chlorate and nuts and bolts as shrapnel were identified from the debris and exhaustive efforts were made to track the source of all such