Lebanese troops have clashed with pro-Syrian Palestinian fighters in eastern Lebanon.
Security officials say the firefight broke out between Lebanese army soldiers and guerrillas of the Fatah Uprising group near Lebanon's border with Syria.
One Lebanese soldier was wounded. There are reports that the guerrillas also suffered casualties, but the numbers are not known.
Security officials say the Lebanese troops were fired on when they approached a Fatah Uprising outpost.
Fatah Uprising is one of several pro-Syrian Palestinian factions operating in eastern Lebanon. In March, the Lebanese government gave them six months to remove gunmen and weapons outside of Lebanon's 12 Palestinian refugee camps.
The violence came hours before the U.N. Security Council adopted a resolution calling on Syria to recognize Lebanon as an independent country and demarcate their common border.
Syria withdrew its troops from Lebanon last year under international pressure after the assassination of the former prime minister, Rafik Hariri.
But several Lebanese political factions claim that Syria still holds sway over Lebanon's government and politics.
Syria says the new United Nations resolution amounts to "interference" in Syrian-Lebanese relations.
Some information for this report was provided by AP and Reuters.