Protesters have stormed the US embassy in Yemen as demonstrations about an anti-Muslim film spread in the Middle East.
Up to 5,000 protesters are trying to get into the US compound in Sanaa, according to local reports.
Hundreds got past two police barricades and managed to get through the main gate into the building.
They were then driven back by security forces firing weapons into the air. TV pictures showed Yemenis trying to scale walls to get back into the compound.
Young demonstrators shouting "we redeem, Messenger of God" smashed windows of security offices outside the embassy and set fire to cars and tyres. Others held banners declaring "Allah is Greatest".
The violence came a day after the US embassy was attacked in Libya, and there are fears protests will spread to other countries in the Muslim world.
US ambassador Chris Stevens and three other American officials died as gunmen fired rocket-propelled grenades and set fire to the compound in Benghazi.
The US is investigating whether it was a co-ordinated terrorist strike to mark the anniversary of the 9/11 atrocity.
It had been thought it was a spontaneous protest provoked by an American-made anti-Islam film, which is being promoted on YouTube and is said to insult the Prophet Mohammed.
But a US counterterrorism official has said the Benghazi violence was "too co-ordinated or professional" to be spontaneous.
Protests in the Egyptian capital continued overnight as demonstrators clashed with police near the US embassy. Police were pelted with rocks and fired tear gas to disperse the crowd.
Egypt's President Mohamed Morsi slammed the film and its "attacks" on Islam, while also stressing that he condemned the violence.
"We Egyptians reject any kind of assault or insult against our prophet. I condemn and oppose all who ... insult our prophet," he said, during an official visit to Brussels.
"(But) it is our duty to protect our guests and visitors from abroad ... I call on everyone to take that into consideration, not to violate Egyptian law ... not to assault embassies."
In Tunisia, police fired tear gas and rubber bullets into the air to disperse a protest by around 200 people near the US embassy in the capital Tunis, apparently about the film.
There were also protests outside US embassies in Morocco and Sudan.
Opponents say the \$5m (£3.1) film, called The Innocence Of Muslims, depicts Mohammed as a fraud and shows him having sex and calling for massacres.
The Pentagon has announced it is moving two warships to the Libyan coast and a group of Marines has been dispatched to the Libyan capital, Tripoli.