A group of armed Maoists attacked the petrol pump, situated on Grand Trunk Road near Barachatti in Gaya district, about 125 km from here, late Thursday. The guerrillas blew up its main building and tried to set ablaze the oil point, tanker and generator room, police said.

No casualty was reported but four employees of the petrol station have been missing since the incident.

Bindi Yadav, former president of the Gaya civic body who has been charged in several criminal cases, owns the petrol pump.

Police suspect that Maoists blew up Yadav's petrol pump since he had not given in to their extortion demands.