Maoists blew up a state-run primary school at Gerua village in Bihar's Banka district in the wee hours on Wednesday. Over 100 ultras surrounded the building at around 2.30 am and used dynamites to trigger the explosion, police said. The roofs of the three-room school caved in due to the explosion.

The school was adjacent to the Sangrampur block office which was blown up by the Maoists last week. The district administration had earlier planned to set up a police post at the school.

Senior officials reached the spot and combing operation was on in the area.