A security source told Xinhua Friday that three people were killed and 36 others were injured during the clashes that renewed in Lebanon's northern port city of Tripoli since Thursday.

The source said that though a cautious clam reigned over the usual confrontation lines between the two rival neighborhoods of Sunni Bab el-Tebbaneh and Alawite Jabal Mohsen last night, the clashes renewed Friday and sniper activities were intensive.

The clashes renewed Thursday following the killing of Walid Barhoum, a Sunni resident of Jabal Mohsen by masked gunmen in Bab el-Tebbaneh, while the Lebanese army troops deployed in the region intensified its patrols in an effort to restore calm to the city.

Since the eruption of the rebellion against the regime of Syrian President Bashar Assad in March 2011, Tripoli witnessed various rounds of violence between the Sunni neighborhood backing the rebellion and the Alawite neighborhood loyal to Assad.

The Lebanese cabinet announced in December 2013 a security plan charging the army of taking control of the city for six months.