A rifle-fired grenade targeted a major police barracks in west Beirut on Wednesday night, witnesses and local media said.

The explosion was heard in the Corniche Mazraa commercial and residential district, in the Muslim section of the Lebanese capital.

Radio and television reports said the grenade targeted a building at the Helou barracks, causing some damage but no casualties.

The blast came amid heightened tensions between Hezbollah and its pro-Syrian allies, and the Lebanese government's anti-Syrian majority.