Hezbollah has said it planted a bomb that injured at least two Israeli troops on the ceasefire line in southern Lebanon.
The Lebanese group said its fighters on Tuesday "detonated an explosive device on the Shebaa Hills against a motorised Israeli patrol, causing a number of injuries among the occupation's soldiers".
The group said the attack was carried out by the "Hassan Ali Haidar unit" which is named for a Hezbollah member killed on September 5 when an Israeli listening device in Lebanon was detonated remotely as he tried to dismantle it.
Israel said it responded to the "unprovoked aggression" by firing artillery at two Hezbollah positions in southern Lebanon.
The army said the attack took place on the Israeli side of the border, calling the attack "a blatant breach of Israel's soverignty" and vowed to protect its northern borders.
Hezbollah and Israel fought a war in southern Lebanon in 2006, wich ended with a UN-brokered ceasefire and an Israeli withdrawal from Lebanese territory.
The ceasefire line between the two countries is often tense. Israeli troops shot and wounded a Lebanese on Sunday
Source: Al Jazeera and agencies