A detonator and other material used for making crude bombs was found in a state transport (ST) bus in Raigad district of Maharashtra, the police said on Thursday.
The material was kept under a seat, said police spokesperson Assistant Inspector Kundan Gawde.
The conductor, while checking the bus after its last service of the day in Rasayani area on Wednesday night, found some suspicious-looking objects under a seat, and alerted local police.
The police called a bomb detection and disposal squad which found that there was a detonator along with electric wires, shrapnels and batteries.
Raigad Police registered a case under the Indian Explosives Act and further probe was on, API Gawde said.