Between 20 and 30 protestors climbed over the walls into the compound while others in a crowd outside numbering up to 300 people outside hurled objects including Molotov cocktails at the building.
Demonstrators clashed with police who tried to keep the crowds away from the leafy embassy compound in upmarket northern Tehran.
On Monday, hundreds of demonstrators led by student members of the hardline Islamic Basij militia attacked the Danish and Austrian embassies in Tehran as anger over the prophet caricatures boiled over into violence in a number of countries around the world.
Tuesday's violence occurred despite the authorities calling on Iranians not to attack foreign missions.
"(The authorities) have told the Iranian people not to attack diplomatic territory," foreign ministry spokesman Hamid Reza Asefi said on state television. "Nevertheless, Western countries should atone for their mistake."
Denmark's ambassador to Tehran, Claus Juul Nielsen, was quoted by the Danish news agency Ritzau as saying he had contacted the Iranian foreign ministry and police to seek protection.
Iran has summoned the ambassadors of Austria, Denmark and Norway to express its anger over the cartoons, which showed the Muslim prophet as a knife-wielding bedouin and another wearing a time bomb-shaped turban.
It has also announced a ban on Danish imports as well as any other business dealings with the country "until further notice" and has recalled its ambassador to Denmark.
The cartoons were first published last September by the Danish newspaper Jyllands-Posten and have since been reprinted other European countries and three Arab newspapers. Austria is the current holder of the rotating European Union presidency.
Source: AFP
