Breaking News: Flight 370 Found; All lives lost as Plane went down in the southern Indian Ocean

Malaysia Airlines Flight 370 went down in the southern Indian Ocean, Malaysian Prime Minister Najib Razak said Monday, citing a new analysis of satellite data by a British satellite company and accident investigators.

A relative of a missing passenger briefed by the airline in Beijing said, "They have told us all lives are lost."

While the announcement appeared to end hopes of finding survivors more than two weeks after the flight vanished, it left many key questions unanswered, including what went wrong aboard the Beijing-bound airliner and the location of its wreckage in the deep, wild waters of the Indian Ocean.