A suicide bomber blew up his car in Beirut on Monday night near an army checkpoint, killing a security officer and wounding several people watching the soccer World Cup in a nearby cafe.
Security forces have been on high alert since a suicide bomber killed one person and wounded 37 near the Syrian border on Friday in an attack that narrowly missed Major General Abbas Ibrahim, head of Lebanon's General Security department.
One security source said before Monday night's explosion that security forces were hunting for two potential suicide bombers in the Lebanese capital.
Lebanon has suffered a wave of sectarian violence linked to the war in Syria which, like its neighbor Iraq, is fighting a Sunni insurgency. Militants, including the Islamic State in Iraq and the Levant (ISIL), are sweeping through the north and west of Iraq towards the Shi'ite-led government in Baghdad.