The Islamic State group claimed responsibility on Monday for a knife attack in Tunisia which killed one National Guard officer and wounded another, as security forces rounded up more suspects.

The attack on Sunday morning in a tourist district of the coastal city of Sousse saw a group of assailants ram a patrol of the National Guard with a vehicle before stabbing the officers.

They were chased by security forces before three of them were shot dead in an ensuing gun-battle, the Guard said, labelling the attack a “terrorist” act.