Thirty Britons were killed in an attack in Sousse last month - and the Foreign Office has now urged all Britons to leave the country.
Following warnings that another terrorist attack is "highly likely" in Tunisia, thousands of British holidaymakers are to be flown home from the country.
The Foreign Office has now urged all Britons to leave Tunisia as thirty Britons were killed in an attack in Sousse last month.
It said extra security measures there did not provide "adequate protection".
Tunisia has criticised the decision, with its ambassador to the UK saying it was "what the terrorists want".
Between 2,500 and 3,000 British package holidaymakers are believed to be in Tunisia, as well as about 500 independent travellers.
The Association of British Travel Agents said its members were aiming to bring customers home in the next 48 hours.
A gunman was reported to have killed 38 holidaymakers in the 26 June beach attack, prompting Tunisia to declare a state of emergency.
Security in tourist areas was increased by the Tunisian government. It also announced plans for a wall along the border with Libya to counter the terror threat.
Tunisia believes gunman Seifeddine Rezgui trained with the Ansar al-Sharia group in the neighbouring country, though the Islamic State group has claimed the attack.
Eight people have been arrested on suspicion of collaborating with Rezgui, who was killed after the shooting spree.