Israeli aircraft struck posts belonging to the Lebanese Shi'ite group Hezbollah early on Wednesday after shots were fired from Lebanon towards its troops, Israel's military said.
No Israeli troops were wounded in the firing, the military said.
Soldiers deployed illumination flares, smoke shells and live fire after the shots from the Lebanese side of the frontier, it said.
Flares fired by the IDF as seen from the Lebanese side of the border
"In response, overnight, IDF attack helicopters and aircraft struck observation posts belonging to the Hezbollah terror organization in the border area," the military said in a statement, referring to the Israel Defense Forces.
There was no immediate comment from Hezbollah.
Early Wednesday, the military ordered residents living in communities near the border with Lebanon to shelter in place and blocked roads following what it described as a "security incident" in the area.
Tension has been running high on the border. Last month, Israel said Hezbollah carried out an infiltration attempt, which the Iran-backed group denied.The Israeli military said it lifted a curfew it had imposed overnight.
Israel considers Hezbollah to be its toughest and most immediate threat. After battling Israel to a stalemate during a monthlong war in 2006, Hezbollah is believed to be far stronger today.
Israeli officials estimate that Hezbollah possesses some 130,000 rockets and missiles capable of striking virtually anywhere in Israel. The group also has gained valuable battlefield experience by fighting alongside Iranian troops backing the forces of President Bashar Assad in the Syrian civil war.
Israel, which considers Iran to be its greatest enemy, has acknowledged carrying out scores of airstrikes in Syria it says were meant to stop Iran from transferring sophisticated weapons to Hezbollah.