Protesters angered by a film mocking Islam have attacked the German and British embassies in the Sudanese capital, Khartoum.
Demonstrators started fires and tore down the German flag, raising an Islamist banner in its place.
In the Lebanese city of Tripoli, one person was killed as demonstrators set fire to a KFC fast-food restaurant.
Five people were injured in protests in Cairo, state media said. There are also clashes in the Yemeni capital, Sanaa.
A spokesperson for the UK Foreign Office confirmed to the BBC that a demonstration was taking place outside the embassy in Khartoum, and said Sudanese police were at the scene.
However, the spokesperson could not say whether protesters had entered the embassy, or whether the demonstration was about the anti-Islam film.
In Cairo, police firing tear gas pushed about 500 protesters back from the US embassy.
Egypt’s Islamist President Mohammed Mursi has called for protests to remain peaceful.
The streets around the US embassy in Cairo have been blocked with barbed wire, concrete and police vehicles.
Islamist groups and others had called for a peaceful “million-man march” in the city, but a number withdrew those calls on Friday.
In Lebanon, protesters in Tripoli, in the north of the country, set fire to a KFC branch, sparking clashes with security forces.
– BBC News