Violent Muslim mobs demanding to "Behead All Those Who Insult the Prophet" riot, clash with police in Sydney, Australia

(CNN) -- As the United States continued to strengthen security at diplomatic stations, fury over an anti-Islam film spread to Australia, where 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," hundreds of 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. Six police officers were injured and eight people were arrested, Sydney police said. Seventeen people were treated for the effects of pepper spray used by police.

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.

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