Several tourists have been airlifted to hospital, after a tour boat sank in Liverpool's Albert Dock.
Coastguards say more than 30 passengers were plunged into the water when the vehicle went down just before 4pm.
The Yellow Duckmarine tour company takes tourists around Liverpool by land and water, in amphibious vehicles.
The North West Air Ambulance is taking the injured away from the scene.
Witnesses say paramedics from 18 other ambulances are treating those who've been hurt.