Seventeen people have been injured after the Waverley Steamer crashed into a pier, just weeks after resuming sailings.
Emergency services were called to the scene at Brodick Pier, on the island of Arran off the west coast of Scotland, on Thursday evening.
Some 213 passengers and 26 crew were on board at the time the steamer smashed into the pier, officials said.
Coastguard search and rescue helicopter from Prestwick and a Helimed have been sent, along with Arran coastguard rescue team.
Scottish Fire and Rescue Service, Scottish Ambulance Service and Police Scotland remain at the scene.
Graham McWilliams, who was a passenger on the steamer, told BBC Scotland’s The Nine he head a “loud bang” when the boat collided with the pier.
“As we came into the pier, everything seemed quite normal,” he said.
“Then there was a sudden crash, a loud bang, and the boat stopped very quickly. I saw people falling and it was quite distressing.”
Coastguards are working with other agencies to ensure everyone is taken safely from the vessel.
The Marine Accident Investigation Branch (MAIB) has been informed.