PANVEL, Oct. 22 -- A fire ripped through a residential flat in Kamothe, Navi Mumbai early on Tuesday morning, killing a 17-year-old and her mother. Fire officials suspect that an electrical fault coupled with a gas leak triggered the tragedy. According to the police, the blaze broke out around 6 am in a second-foor apartment at the Ambe Shraddha Cooperative Housing Society, Sector 36, jolting residents awake with a loud blast and thick smoke. The deceased, Rekha Shisodia, 45 and her daughter were trapped in their bedroom. Firefighters later found both lying lifeless on the bed, charred beyond recognition. "Both were found dead on their bed, possibly having inhaled smoke and fallen unconscious before getting burnt," said officials. Praveen Bodake, the state City and Industrial Development Corporation's (CIDCO's) chief fire officer, said preliminary findings point to an electrical fault that triggered the tragedy. "Based on the condition of the site, it appears the fire started at least 45 minutes before the cylinder blast," he said. "Cylinders usually explode only after being exposed to heat for a prolonged period." Bodake confirmed that one LPG cylinder had exploded inside the flat. The force of the blast was strong enough to cause partial damage to the apartment above, said Bodake....