(VOVworld) - A US infrared satellite has reportedly detected a heat flash at the time a Russian passenger jet went down in Egypt's Sinai Peninsula, a US official has said, as the investigation into the deadly plane crash continues. The official told NBC News on Tuesday that the US intelligence community believes that it could have been some kind of explosion on the plane itself, either a fuel tank or a bomb. The same satellite imagery ruled out a surface-to-air missile attack, the news channel reported. The jet crashed on Saturday, killing all 224 passengers and crew on board.