3 things you need to know:
Malaysia Airlines Flight 17 was shot down on Thursday over eastern Ukraine with 298 people on board — nearly 200 of them were Dutch. There are no known survivors.
U.S. officials believe the plane was downed by a missile fired by pro-Russian separatists. It may have been mistaken for a Ukrainian air force cargo plane.
World leaders are demanding an immediate investigation.
Live Updates on MH17
Tags: MALAYSIA AIRLINES, MALAYSIA AIRLINES FLIGHT 17 IN UKRAINE, Ukraine, US & World, WORLD