Travel advice for Britons travelling to countries such as Tunisia and Egypt remains unchanged despite a string of attacks on US consulates, embassies and business interests.
The violent protests over a film deemed offensive to Muslims led to several people being killed and injured outside the US embassy in Tunis on Friday and demonstrations in Cairo and other cities in North Africa and the Middle East.
British, Swiss, German and Dutch properties across the region have also been targeted, according to the Foreign and Commonwealth Office.
The US State Department now advises against all travel to Tunisia for US travellers. The overall travel advice for British travellers to the country has not changed and there are no travel restrictions.
The FCO said: “We strongly recommend that British nationals avoid all forms of demonstration. While many protests pass without incident there is the possibility of injury if you are caught up in a demonstration that does not remain peaceful.
“If you become aware of any nearby violence you should leave the area immediately and keep yourself informed of developments by checking the news, observing the instructions given by the security authorities and/or your tour operator and regularly check this advice.”
Britons in Cairo have been urged to exercise caution in the immediate vicinity of the US Embassy and avoid any demonstrations.
US Ambassador Chris Stevens and three other US consulate staff were killed in an attack on the US consulate in Benghazi in Libya last week.