Sharm el-Sheikh, Muharram 25, 1437, Nov 7, 2015, SPA -- A noise was heard in the last second of the cockpit voice recording from the Russian plane that crashed last week in Egypt's Sinai, killing all 224 people onboard, the head of the investigation team said Saturday. Ayman el-Muqadem told a news conference in Cairo that an analysis of the noise was underway to identify its nature. He said the way the debris was scattered over a wide area indicated the Airbus A321-200 broke up mid-air, but initial observations don't shed light on what caused it. "All scenarios are being considered ... it could be lithium batteries in the luggage of one of the passengers, it could be an explosion in the fuel tank," said El-Muqadem, who is Egyptian and leading the investigation committee. It includes members from Russia, France, Germany and Ireland, where the plane was registered, AP reported. --SPA 21:07 LOCAL TIME 18:07 GMT www.spa.gov.sa/w