The police on Monday recovered around 40 crude bombs from a field in Nadia district`s Molandi village, where a 13-year-old girl was killed a week back in a bomb explosion during the counting of votes of Kaliganj assembly constituency byelection.

A senior police officer said that though no one was apprehended so far in connection with the recovery of the crude bombs, nine persons have been arrested over the murder of the girl.

During a search operation in Molandi, the police recovered 40 crude bombs stored in a bucket in a field, the officer said.