All British nationals are being urged to leave Tunisia because “a further terrorist attack is highly likely”, Foreign Secretary Philip Hammond says.

The Foreign Office estimates 2,500 to 3,000 UK tourists are in Tunisia and a few hundred British residents.

There is no specific threat, but travel firms are seeking to fly Britons out over the next few days and some are repatriating their British staff.

Thirty Britons were among 38 tourists killed in a gunman’s attack on 26 June.

The Foreign Office has also advised against all non-essential travel to Tunisia.

It said although Tunisian authorities had put in place more security measures since the June attack, these did not provide “adequate protection for British tourists”.

But Nabil Ammar, the Tunisian ambassador to the UK, told BBC’s Newsnight the decision was “what the terrorists want”, saying it would also damage the country’s tourist industry.

Naveena Kotoor, a freelance journalist in Tunis, the capital of Tunisia, said people in the country were “devastated” by the advice to tourists.