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
The US space agency NASA's Dawn spacecraft has become the first mission to achieve orbit around a dwarf planet.
Comedian Peter Kay has said he is "thrilled" to star in a adaptation of broadcaster Danny Baker's autobiography.
MPs have warned of legal loopholes are allowing police to store photographs of innocent people to use with facial recognition systems.