The Danish consulate in Lebanon has been set alight by protestors angry over newspaper cartoons depicting the prophet Mohammed.
Security forces fired tear gas at the crowd and used water cannons to disperse the demonstrators who tried to burned everything in their path.
The army has now sealed off all roads leading to the mission in the eastern part of the capital Beirut.
Violence erupted in a pitched battle between police and protestors bringing traffic to a halt across the Christian neighbourhoods of the city.
More than thirty people have been hurt in the clashes.
Thousands here are calling for vengence against Denmark, the country where the caricatures first appeared.
Many Muslims find depicting the Prophet offensive and the publication of the cartoons has sparked anger across the Islamic world.