Man who threw cigarette butt questioned over blast at Delhi CRPF school

A man who threw a cigarette butt is among the 50 people being questioned by the police after they were spotted near the CRPF school in Delhi's Rohini before an explosion took place near it last month. "Whether...blast took off due to...cigarette butt is yet to established as we still don't know...exact composition of the explosive," a police officer said.