Britain has warned that Islamist militants may launch further attacks on tourist resorts in Tunisia after a gunman killed 39 people, including at least 15 Britons, in the worst assault of its kind in modern Tunisian history.


Attacks may be carried out by "individuals who are unknown to the authorities and whose actions are inspired by terrorist groups via social media", the Foreign Office said in updated travel advice on its website late on Saturday.


With some British tourists holidaying in Tunisia still unaccounted for, the number of Britons confirmed killed in the attack is expected to rise. Many Britons were due to fly home from Tunisia on Sunday, having cut short their holidays.