Twelve people have been arrested in the investigation in to the massacre at a beach resort in Tunisia that killed 38 people, mostly British tourists, officials said today.

Tunisia's Radio Mosaique reported that Lazhar Akremi, a senior official with the ruling Nida Tounes party, made the announcement at a party meeting. The report did not say when or where the arrests took place.

The Tunisian government is holding a news conference today in the capital Tunis about the investigation into Friday's attack.

The Islamic State group claimed responsibility for the attack, in which a Tunisian student opened fire on a beach in the resort of Sousse. The attacker was later killed by police.

At least 29 Britons, and other European tourists, are confirmed among the dead.