Youths on Friday attempted to storm the Tripoli Serail in protest against a film that mocks Islam.
One person was killed and 25 were wounded in the ensuing clashes between the protesters and the security forces.
The Lebanese army soon began to deploy in the area, said Voice of Lebanon radio.
Security forces soon cordoned off the area to prevent them from heading any further, added VDL.
The youths then began to pelt the building with stones, it added.
VDL later reported that calm has begun to return to the city.
The protesters had earlier set fire to a KFC and Hardees restaurant in the northern city.
A low-budget movie, "Innocence of Muslims" in which actors have strong American accents and portrays Muslims as immoral and gratuitously violent has sparked angry and violent protests across the Muslim world.
It pokes fun at the Prophet Mohammed and touches on themes of pedophilia and homosexuality, while showing him sleeping with women, talking about killing children and referring to a donkey as "the first Muslim animal."
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