A bridge has collapsed dramatically in Minneapolis, sending cars and people into the Mississippi river below.
Footage shows other vehicles piled on top of each other on top of the bridge.
A train is lying crushed underneath one section of the rubble.
One US news report says a school bus with children onboard stopped just feet away from plunging into the river.
Reports say at least one person has died but that number is expected to rise.
US Homeland Security said there was no reason to believe terrorism was behind the disaster.
It said the department was monitoring the situation.
Witnesses said they heard a roar shortly before the structure disintigrated.