Police used water cannons to break up a protest Friday by relatives of several kidnapped Lebanese soldiers, after the protesters blocked a main highway in the capital.
Several protesters and some journalists were also beaten by security forces as they broke up the demonstration.
The Islamic State group and al-Qaida-linked Nusra Front in Syria seized some 20 Lebanese soldiers and police officers in August during a brief cross-border raid. They have already killed three of the captives, beheading two.