DFDS Vice President Gert Jakobsen told ITV News that 15 passengers and eight crew members were treated for smoke-related injuries on the King Seaways ferry following a fire on board.
Four crew members and two passenger were later taken to Scarborough Hospital by helicopter for further treatment. Police are investigating the incident.
More top news
Newly-released documents reveal how British spymasters used an enticing female agent to test the mettle of rookie spies.
Researchers studying the King's remains believe he died after sustaining numerous blows to the head.
Edinburgh and its institutions have been at heart of the Union since it came about in 1707, here we look at the city's history.