Surat: A major fire broke out at the ONGC oil well in Surat, possibly due to a gas leakage, injuring seven people on Saturday. The injured have been rushed to Surat hospital with many inflicted with third degree burns. The injured are in a critical condition, said hospital authorities. Fire fighters rushed to the spot and efforts are going on in war footing to contain the blazing flames. No reports of anyone being killed has been received yet.