Tourists were being warned to avoid large parts of Tunisia as the threat of terrorism in the country heightened.
The warning, issued by the Foreign and Commonwealth Office (FCO), follows attacks by dissidents, who reportedly killed 14 soldiers and injured 20 more in the Chaambi Mountains in the far west of the country, near the Algerian border.
The popular holiday destination attracted more than 400,000 British tourists last year, but travelers were being warned to be "extra vigilant".
An FCO spokesman said: "Our advice makes clear that there is a high threat from terrorism in Tunisia.
"We continue to advise against travel to the Chaambi Mountain National Park area."
Other areas to avoid included the towns of Nefta, Douz, Medenine and Zarzisj, and to within 30km of the border with Algeria from south of the town of Ghardinaou.