Hundreds of people have filled the streets of Beirut for the funeral of a top Hezbollah commander killed in Syria.
Mustafa Badreddine is said to have died in an explosion targeting one of the Shia group's bases. They have announced that extremists were behind the attack, adding it would strengthen their resolve to fight the rebels.
Hezbollah fighters are in Syria to support President Bashar al-Assad.
There have been reports that Israel was behind the deadly attack, which happened near Damascus airport.
Israel made no immediate response to that claim.
Fifty-five-year-old Badreddine was assessed by the US as being responsible for Hezbollah's military operations in Syria.
The group has lost at least four prominent figures in Syria since January last year. This, despite Russian intervention in support of Assad and his allies.
But Badreddine's death is the biggest blow to Hezbollah since its military chief was killed in 2008.