Bengaluru: Bengaluru is sitting on a time bomb, even as police look the other way. The minor blast triggered by a detonator in a school is just more proof of the illegal explosives market thriving in the city. Illegal trade in gelatin and ammonium nitrate is rampant as they are widely used for blasting in construction work and illegal quarrying. That the city is already in the shadow of terror was witnessed only recently, when a bomb went off killing a woman. Police officers admit in private that if subversive elements begin working in cahoots with those trading in illegal explosives, the city is in deep trouble.