A bomb has exploded in a petrol pump at Mirchaiya Municipality-5 in Siraha district last night. An unidentified gang of three-four persons threw the bomb targeting the Sheela Petrol Pump. The bomb has caused minor damage to the petrol pump after its explosion. No human causality was reported in the incident but the normal life in the area is terrorized after the bomb blast. The Area Police Office, Mirchaiya, said that investigations in the incident are underway.