A high-speed train collision killed at least 39 people, Spanish authorities said Monday, as they worked to piece together what may have led to the deadly crash.

A high-speed train derailed, jumped onto the track in the opposite direction and slammed into an oncoming train Sunday in southern Spain, killing at least 20 people and injuring dozens more, officials...

At least 21 people are dead and more than 100 others are injured, some of them seriously.