The Islamic State (IS) militant group said that they causd the bomb blast in bus. It was behind a deadly attack on a bus carrying presidential guards in the Tunisian capital Tunis.
In a message on social media it said a suicide bomber carried out the attack, which killed 13 people.
A backpack or belt containing 10kg of military explosives was used, Tunisia’s Interior Ministry said.
IS has already claimed two high-profile attacks on the country’s tourism industry this year.
The White House has condemned the latest attack “in the strongest terms”.