New protests erupted across the Muslim world Friday, where anger is spreading over an anti-Islamic video posted on the Internet.
The most recent protests broke out in Tunisia's capital of Tunis, where police fired tear gas at rock-throwing demonstrators, some of whom were amble to jump over the wall surrounding the U.S. embassy.
The violence also spread to Sudan, where witnesses said police clashed with thousands of protesters heading toward the U.S. embassy. Protesters are also reported to have breached the German embassy.
Friday was the fourth day of protests over the film, which was a topic of conversation at Friday prayers across the Middle East, south and east Asia and Africa. Many demonstrators have been targeting countries they feel have not done enough to stop the video from being made.
U.S. and other foreign missions stepped up security following violent attacks that began Tuesday.
Some of the biggest demonstrations have taken place in Cairo, where protesters near the U.S. embassy Friday were met by police, who responded by firing with tear gas.
Protests have also taken place in Malaysia and Indonesia and security was tight in Kabul, Afghanistan.
In Benghazi, Libya, where the U.S. ambassador and three other American personnel were killed in an attack Tuesday, security was stepped up around the city and the airport temporarily closed.
U.S. warships are headed to the Libyan coast, while additional U.S. marine guards were deployed to protect the American embassy in Yemen, breached by protesters Thursday.
Libyan officials said Thursday that they have arrested four people in connection with this week's assault on the U.S. consulate in Benghazi that killed U.S. Ambassador Christopher Stevens and three of his staff. The officials did not provide details.
American intelligence agencies are examining the alleged involvement of pro-al-Qaida militants. But they say they do not have solid evidence.