Two men have been arrested after a fire alert on a North Sea ferry sparked an emergency evacuation.

Six people were taken to Scarborough Hospital by RAF helicopter but are not thought to be in a serious condition.

A further 15 passengers and eight crew members were treated by doctors for smoke-related injuries on board the ferry.

Northumbria police said a 26-year-old has been arrested on suspicion of arson and a 28-year-old was arrested on suspicion of affray.

The fire broke out in a cabin on the DFDS King Seaways ferry while it was sailing to Amsterdam on Saturday night.

The blaze was extinguished within 15 minutes, according to the company.

RAF helicopters from Leconfield near Hull, and Boulmer, Northumberland were scrambled to the vessel along with two RNLI lifeboats from Bridlington and Filey.

The 30,000-tonne ship arrived back at Newcastle Ferry Port, in North Shields, at around 4am and passengers were kept on board until 9am while police investigated.