At least 70 crude bombs were found and seized from two places in West Bengal's Birbhum district Wednesday, police said.
Kept in two plastic drums, 50 crude bombs were found inside a pond in Sattore village.
At least 20 more bombs were found in an under-construction building of Rampurhat College in Rampurhat.
"The bomb disposal squad is working to defuse the bombs," said a police officer.
Earlier in October, police recovered 17 drums containing crude bombs from a health centre in the village.