The violence began when sticks and rocks were used in fighting between members of the Shi'ite Amal movement and Maronite supporters of former warlord Samir Geagea.

When gunfire broke out, Lebanese army units were deployed to the area to end the violence. Several gunmen from both sides were arrested.

Geagea's supporters had been celebrating after the Lebanese parliament decided to grant him an amnesty after 11 years in jail.

During Lebanon's 1975-1990 civil war, the Green Line marked the divide between Christian east Beirut and the mainly Muslim west of the city. (Reuters)