(CNN) - As the United States continued to strengthen security at diplomatic stations, fury over an anti-Islam film spread to Australia, where hundreds of demonstrators clashed Saturday with police outside the American Consulate in Sydney.
Carrying signs that read: "Obama, Obama, we like Osama" and "Behead All Those Who Insult the Prophet," protesters gathered on the steps of the consulate.
The demonstration turned violent after protesters were pushed back from the building.
Authorities used tear gas and police dogs to disperse protesters who threw bottles and shoes -- considered a grave insult among Muslims. At least four people were injured, including a police officer, according to witnesses and authorities.
In his weekly address, U.S. President Barack Obama acknowledged "images on our televisions are disturbing."
"But let us never forget that for every angry mob, there are millions who yearn for the freedom and dignity and hope that our flag represents," Obama said.
Obama reiterated that those who killed U.S. Ambassador to Libya Chris Stevens and three other Americans at the U.S. Consulate in Benghazi will be brought to justice.
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 missions and protect diplomatic staff," Catherine Ashton, the European Union foreign affairs chief, said in a statement.
U.S. Marines were dispatched to Libya, Yemen and Sudan to safeguard American diplomatic posts, according to U.S. officials.
Secretary of State Hillary Clinton warned 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, a city of more than 18 million people.
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.
Hundreds of police still in Tahrir Square
Here's a breakdown of events Saturday around the globe:
-- In Egypt's northern Sinai Peninsula, a large number of security forces backed by tanks regained control of a base housing an international peacekeeping force that was breached Friday by Islamist militants, state-run EGYnews reported Saturday.
The militants carrying automatic weapons burned trucks and a watch tower on the base. The armed clashes injured at least four troops and an Islamist Bedouin.
The 1,500-troop mission has supervised the security of the Egyptian-Israeli peace treaty since 1979.
Egyptian security forces, including the military, have been fighting militants in Sinai since August after 16 border guards were killed in an attack by Islamist militants.
-- In the Egyptian capital of Cairo, large numbers of police were patrolling the streets following clashes shortly after dawn Saturday between protesters and plain-clothes security officers. Hundreds of riot police remained in Tahrir Square as workers cleaned streets and businesses around the clashes assessed damage.
-- In Afghanistan, the Taliban claimed responsibility for an attack on a joint U.S.-British base in Helmand province that left two U.S. troops dead, saying the attack was in response to the film. The attack follows a call by the Taliban on its fighters to take revenge for the film by increasing assaults on NATO troops.
-- In Tunisia, authorities warned Saturday the death toll may climb following