This picture shows a general view of the Cumberland Hotel in central London. Picture: ANDREW COWIE

London - British police were holding four suspects in custody on Wednesday after three wealthy female Emirati tourists were bludgeoned in a hammer attack in their luxury London hotel room.

The attack happened at around 2.00am on Sunday in a room on the seventh floor of the Cumberland Hotel.

On Tuesday, officers arrested three men aged 56, 34 and 32 on suspicion of attempted murder following raids at addresses in north London, according to a Scotland Yard statement.

A 31-year-old woman was also arrested on suspicion of handling stolen goods. All four remained in custody Wednesday, police said.

One of the victims remains in a critical condition in hospital. The other two women are also in hospital, but their injuries are not believed to be life-threatening, the statement said.

Police believe the victims had left their door unlocked as they were staying as part of a large family group who had adjoining rooms.

The wealthy family, who had come to London for shopping and sightseeing, arrived in Britain between Thursday and Saturday and the women had visited high-end stores on Saturday.

No keys were stolen from the hotel and police said there had been no breach of security at the venue.

Detectives are scouring security camera footage to establish the movements of both the women and the suspects earlier on Saturday. - AFP