Thousands angry over Danish cartoons depicting the Prophet Mohammed set fire to the Danish consulate in Beirut, Lebanon.
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The protesters looted the building Sunday, CNN reported, until hundreds of troops intervened to restore order.
The Lebanese protest came one day after Syrians set fire to the Norwegian and Danish embassies in Damascus, the BBC reported.
Norway and Denmark have called for their citizens to leave Syria.
"The principle of diplomatic relations is that diplomats can work safely and the fact that this has been broken is extremely serious," Norwegian Foreign Minister Jonas Gahr Stoere told a news conference in Oslo on Saturday.
"It's horrible and totally unacceptable," Denmark's Foreign Minister Per Stig Moeller told Danish public television.
Thousands of protesters scaled the Danish site in Damascus Saturday amid chants of "God is great," before moving on to attack the Norwegian mission.
The cartoons, one of which depicts Mohammed as a terrorist, sparked Muslim outrage across the world following their publication in a Danish paper in September. Any images of the prophet are banned under Islamic tradition.