EgyptAir jet sent smoke-alarm warnings before crash

The EgyptAir jet which crashed in the Mediterranean Thursday sent a series of warnings indicating that smoke had been detected on board, shortly before it disappeared off radar screens. A spokesman for France's BEA air accident investigation agency said the signals did not indicate what caused the smoke or fire on board the plane. But they offered the first clues as to what unfolded in the moments before the crash. A fire on board would likely have generated multiple warning signals, while a sudden explosion may not have generated any - though officials stress that no scenario, including explosion, is being ruled out. Analysis of the debris and recovery of the plane's twin flight recorders are likely to be key to determining the cause of the crash - the third blow since October to Egypt's travel industry. <br/>