Tunisian authorities have identified a suicide bomber who targeted presidential guards on a bus in a deadly attack, saying he was a 27-year-old local street vendor.

The so-called 'Islamic State' group has claimed responsibility for a bus attack in Tunisia which killed at least 13 people.

Tunisian authorities have arrested more than 20 suspected militants in a nationwide security crackdown since gunmen killed 23 people, mostly foreign tourists, in Wednesday’s attack in the capital.

Tunisia's prime minister says 21 people are dead after an attack on a major museum, including 17 foreign tourists - and that two or three of the attackers remain at large.

Two gunmen and one officer have been killed in a security raid after a museum attack in Tunisia, the interior ministry said.

Gunmen have opened fire at a leading museum in Tunisia’s capital, killing at least eight people, authorities said.

Seven foreigners and one Tunisian have been killed in a shooting attack at a leading Tunisian museum, the interior ministry said.