Baltimore bridge collapse: what we know about the bridge, ship and port

Biden laments terrible accident' as six people still missing after Francis Scott Key Bridge snapped from collision with vessel

• Baltimore bridge collapse - latest updates

A bridge in the US city of Baltimore has snapped and collapsed after a ship collided with one of its support columns. Rescuers are searching the water for survivors and the state's governor has declared a state of emergency.

Joe Biden has said search and rescue efforts remain a top priority", as six people are still missing. The president added there was no evidence the collapse of the bridge was intentional, calling it a terrible accident".