Emergency personnel have been called to the scene of a major bridge collapse in the US (file). -AP
A portion of a major bridge in the US city of Baltimore has collapsed after a large boat collided with it.
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A large vessel crashed into the Francis Scott Key Bridge, catching on fire before sinking and causing multiple vehicles to fall into the water below, according to a video posted on X, formerly known as Twitter.
"All lanes closed both directions for incident on I-695 Key Bridge. Traffic is being detoured," the Maryland Transportation Authority posted on X on Tuesday.
The Baltimore mayor said emergency personnel were on the scene and rescue efforts were under way.