The fury over an anti-Islam film that targeted American diplomatic missions has spread to a number of other Western facilities in the Muslim world, raising the specter Saturday of a widening protest.

Attacks on German and British embassies in Sudan, the ransacking of an American school in Tunisia, a fire at a U.S.-based fast-food restaurant in Lebanon and attacks against multi-national peacekeepers in Egypt's Sinai Peninsula were among the latest targets in protests that turned violent.

The unrest reached Australia, where hundreds of demonstrators clashed Saturday with police outside the U.S. Consulate in Sydney.

Top Western diplomats warned leaders in countries where the unrest has been most pronounced to ensure the protection of its missions and its people.

"I am following the unfolding events with grave concern and call on national authorities in all countries concerned to swiftly ensure the security of diplomatic mission and protect diplomatic staff," Catherine Ashton, the European Union foreign affairs chief, said in a statement.

"It is vitally important leaders across the affected regions should call immediately for peace and restraint."

Capital cities and other cities in North Africa and the Middle East where protests against an anti-Islam film have broken out. Capital cities and other cities in North Africa and the Middle East where protests against an anti-Islam film have broken out.

Secretary of State Hillary Clinton took it one step further, warning that the United States would take action to protect its diplomatic facilities if the countries in question did not stop the violence and seek justice for the attacks.

"Reasonable people and responsible leaders in these countries need to do everything they can to restore security and hold accountable those behind these violent acts," she said Friday. "And we will ... keep taking steps to protect our personnel around the world."

From Morocco to Malaysia, thousands of Muslims have taken to the streets in recent days -- with sometimes deadly results -- over the release of a 14-minute trailer, privately produced in the United States, that mocks the Prophet Mohammed as a womanizer, child molester and ruthless killer.

Despite the firm condemnation by U.S. government officials, some in the Muslim world -- especially those raised in regimes in which the government must authorize any film production -- cannot accept that a movie like "Innocence of Muslims" can be produced without being sanctioned by Washington, said Council of Foreign Relations scholar Ed Husain.

"They're projecting ... their experience, their understanding (that) somehow the U.S. government is responsible for the actions of a right-wing fellow," said Husain, a senior fellow at the New York think thank.

The demonstrations, notably, haven't all been violent and the protesters represent only a fraction of their respective nations' populations: A few thousands, for example, clashed with security forces outside the U.S. embassy in Cairo, in a city of more than 18 million people.

But protests that have turned violent have led to a number of deaths -- including those of the U.S. ambassador to Libya and three other Americans killed in an attack Tuesday in Benghazi, Libya.

Libyan authorities said they were cooperating with a U.S. investigation into the Benghazi attack.

"Things are moving very, very well," Muhammad Alkari, spokesman for the prime minister's office, told CNN.

The FBI was expected to arrive in the country Saturday.