An investigation opened Sunday hours after a helicopter crash in Egypt that killed eight French soldiers and another foreign peacekeeper, DPA reported. A source in the Egyptian Ministry of Civil Aviation said Egypt would cooperate cooperate in the probe into how the UN observer mission helicopter crashed in the Sinai Peninsula. Three charred bodies were found and the other six soldiers on board were missing presumed dead, flight authorities in Cairo said. All belonged to UN peacekeeping forces. Pan-Arab news reports said they were on a training mission. The aircraft took off from al-Gura airport in Sinai and was heading south to St Catherine. Ministry sources said that around 10 kilometres away from al-Gura, at 6:15 GMT, the aircraft crashed into a mountain. The UN observer mission has been stationed in Sinai since 1982.