A mixture TNT and RDX explosives were used in the Karachi CID attack, revealed the final report by Bomb Disposal Squad issued on Monday. The report said that a mini truck laden with 300kg explosives was rammed into the building. Hand grenades and gun rounds were also found from the site. The experts stated that a mixture of RDX and TNT ate up the oxygen from the site, which averted the fire. Such a huge quantitiy of RDX has never been used earlier in Karachi.