Baltimore bridge collapse: What we know [Video]

A cargo ship rammed into Baltimore’s Francis Scott Key Bridge early Tuesday, causing the span to collapse and rescuers to launch a massive search for at least six people who are missing.Video above: Experts examine why Key Bridge collapsed so easilyHere’s what we know so far about the disaster:What exactly happened?The operators of the Dali cargo ship issued a mayday call that the vessel had lost power moments before the crash, Maryland Gov. Wes Moore said. But he said the ship was still barreling toward the span at “a very, very rapid speed.”The 985-foot-long vessel struck one of the 1.6-mile bridge’s supports, causing the span to break and drop into the water within seconds. The ship caught fire, and thick, black smoke billowed out of it.Synergy Marine Group, which manages the ship, said it was in the control of one or more pilots, who are local specialists who help navigate …