Berhampur: Three members of a family were injured in a suspected cooking gas leak at a house in Khallikote in Ganjam district on Thursday. The injured, Kapil Moharana (60), his wife Mira (55) and son Bikash (30), were first shifted to Khallikote hospital and then referred to MKCG Medical College and Hospital. The condition of Kapil and his son is critical, sources said. Another son who was in a different room escaped the blast.The explosion was so powerful that it blew off the iron grills, damaged the building walls and several household articles. Local people rushed to the blast site, rescued the family members and shifted them to the hospital before informing the police. Senior police officers, scientific team, dog squad and bomb disposal squad rushed to the spot to ascertain the cause of the explosion.Though the exact cause of the explosion was yet to be ascertained, police suspect the incident might be caused due to the leakage of cooking gas from the LPG cylinder, said SP (Ganjam) Harish BC. He said the bomb disposal squad (BDS) from Bhubaneswar examined the spot through visual inspection and with an explosive vapour detector (EVD).During the search they did not find any explosive substances in the house. He said inquiry is on to find out the exact cause of the incident. Sources said the victim’s family was staying in the house for the last few years on rent. One of the sons of Kapil was working as a revenue inspector while another one preparing for the competitive examinations.