Greg Keller

French authorities formally opened a terrorism investigation Tuesday after a thwarted attack on a high-speed train last week, saying the suspected gunman had watched a jihadi video onboard minutes before the violence.

A sea-crusted wing part washed up on an island in the western Indian Ocean may be the first trace of Malaysia Airlines Flight 370 since it vanished nearly a year and a half ago, and a tragic but finally solid clue to one of aviation's most perplexing and expensive mysteries.

French investigators cracked open the mangled black box of a German jetliner on Wednesday and sealed off the rugged Alpine crash site where 150 people died when their plane slammed into a mountain.