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Syrians march on U.S. Embassy
Riot police, armed with batons and shields, have surrounded the US embassy in Damascus, which has closed due to "increased security concerns".
The US state department and the White House have refused to confirm, deny or comment on the alleged attack.
The Syrian government has demanded an apology from Washington.
It also threatened to cut off co-operation on Iraqi border security if the US carries out any more raids on Syrian territory.
Unnamed US officials said the target of the attack was the leader of a network with links to al-Qaeda, smuggling foreign fighters into Iraq.
Damascus said it was doing all it could to stem any traffic of foreign fighters across the long and porous border.
Iraq has said it will share the results of its own investigation into the raid near Abu Kamal, some eight kilometres (five miles) north of Iraq's border with Syria.
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