At least three protesters have died in Tunisia as mobs attacked the US embassy. International protests at a video deemed offensive to Islam earlier saw the German embassy in Sudan attacked.
State television in Tunisia said that three people had died on Friday as police fought off hundreds of protesters who attacked the embassy.
Tunisian security personnel were reported to have fired live rounds, while protesters smashed windows and threw petrol bombs and stones at the police from inside the embassy.
Fires were started inside the embassy and the compound, with smoke seen rising from the grounds.
Tunisian President Moncef Marzouki condemned what he called "an attack against the embassy of a friendly nation."
Outrage at the content of the video spread beyond the Arab world on Friday, with protests as far afield as Bangladesh and Indonesia. The 14-minute movie trailer, deemed to insult Islam's prophet Muhammad, has generated fury, with Western interests - including the German embassy in Sudan - attacked in several countries.
Sudan's police force had used tear gas to stop more than 5,000 demonstrators from storming the German and British embassies. Some were able to storm the main gates of the German embassy. The protesters attacked its facade and tore down the flag, replacing it with a black Islamic one before setting fire to the building.
German Chancellor Angela Merkel on Friday voiced her "great worry" about the violence.
"The persistent violence in the Arab world fills me with fear. I forcefully condemn the attacks against the German embassy in Khartoum, as well as those against several American embassies," Merkel said.
"Arab governments must do everything to ensure security at diplomatic missions," she said.
'The tyranny of a mob'
As the remains of four American diplomats killed in an attack on the US consulate in Benghazi, Libya on Tuesday were repatriated, US Secretary of State Hillary Clinton condemned the violence.
Referring to attacks on embassies in countries transformed as a result of last year's so-called Arab Spring, Clinton said that the "people of Egypt, Libya, Yemen, and Tunisia did not trade the tyranny of a dictator for the tyranny of a mob."
Washington was reported on Friday to have deployed US Marines to protect its embassies in Libya and Yemen.
rc/slk (AFP, dpa, Reuters)