The Hague - Two British passengers on a Dutch-bound ferry were airlifted to hospital in a serious condition after two separate fights onboard, including one over a slice of pizza, Dutch police said on Sunday.

The incidents took place on the 1 360-passenger ferry Pride Of Rotterdam during an overnight trip from Hull in England to Rotterdam, the world's fifth-largest port.

The first incident happened at around midnight (23h00 GMT) when a 25-year-old Briton allegedly snatched a slice of pizza from another, sparking an argument.

“This led to a scuffle in which the 25-year-old man fell down a flight of stairs, seriously injuring his neck in the process,” police said in a statement.

Two Britons, aged 23 and 27, were arrested in connection with the fight upon arrival in Rotterdam.

In a second incident at around 3am (02h00 GMT) on Sunday, four British men got into a fight in which an 18-year-old teen was stabbed in the neck with a piece of glass.

A 26-year-old man and two other 18-year-olds were arrested on arrival in port, police said.

“Both victims were seriously injured and airlifted by helicopter to a local hospital,” Rotterdam police spokesperson Loek Houtepen told reporters. - Sapa-AFP