A CRPF personnel found the bombs following a tip off, a Cobra batallion officer said.
Today's find is the first in the area since April 2011 and is believed to be the handiwork of Maoists, who once overran the area. Maoists posters, however, had been found on several occasions at the Jharkhand-Bengal border which falls in the area.
The officer said a search was conducted in the jungle with the help of sniffer dogs and Cobra personnel went to the spot.
No one was arrested or detained so far in this connection, he added.