Nearly three days after it disappeared while en route from Kuala Lumpur to Beijing, mystery still shrouds the fate of Malaysia Airlines flight MH370 and the 239 people on board. The failure of the plane's pilots to send a distress signal has given rise to speculation there was a sudden catastrophe -- possibly caused by a mechanical failure or an explosion. "If it had been an impact at sea level of the whole craft, chances are more debris will be found immediately," said Chris de Lavigne, an expert on aerospace and defence issues at business consultancy Frost & Sullivan. Air France flight 447 crashed into the Atlantic Ocean in June 2009 while on a flight from Rio de Janeiro to Paris, killing 216 passengers and 12 crew.
BEIRUT (AP) — With the release of 13 Greek Orthodox nuns held hostage by the al-Qaida-linked Nusra Front in Syria for over three months, here's a list of some other prominent people, including clerics, journalists and activists still missing in Syria and believed in the captivity of rebels. Many are thought to have taken by radical factions, in particular the al-Qaida breakaway group known as the Islamic State of Iraq and the Levant.