The Israeli army earlier urged local residents to seek shelter saying a "security incident" was "evolving."

A sign in Hebrew is stuck onto a barricade and reads,
A sign in Hebrew is stuck onto a barricade and reads, "Blocked route, no entry for military vehicles of any sort" near a gate in Zar'it northern Israel, close to the border with Lebanon August 28, 2019. (Reuters)

Israel's army has said it had conducted air strikes on Hezbollah observation posts in Lebanon in response to fire from across the border directed at its troops.

"During operational activity in northern Israel last night, shots were fired from Lebanon toward IDF troops. We responded with fire, & our aircraft struck Hezbollah observation posts near the border," the Israel Defense Forces said on Twitter. 

The Israeli army earlier reported a "security" incident and told local residents to seek shelter.

Lebanon rejected an Israeli call to reform a UN peacekeeping force patrolling the border ahead of a UN Security Council vote to renew its mandate.

Israel and Lebanon are still technically at war, and the United Nations force, UNIFIL, is tasked with monitoring a ceasefire.

The Israeli army said in a statement a "security incident" was "evolving" in the area of Manara, a kibbutz near the UN-demarcated Blue Line border in northern Israel.

"A number of routes in the area have been blocked. Any kind of activity in open areas is forbidden, including agricultural work," the army added.

"Residents are asked to remain in their houses, and near shelters, ready to find shelter upon immediate notice."

The army gave no information on the nature of the incident, which comes after Lebanon's Iran-backed Hezbollah movement announced at the weekend that it had brought down an Israeli drone flying over the Blue Line border.

READ MORE: Are Hezbollah and Israel really ready for war?

Tensions rise 

Hezbollah vowed in September last year to down Israeli drones flying over Lebanon, following an incident a month earlier when two drones packed with explosives targeted the group's stronghold in south Beirut.

Set up in 1978, UNIFIL was beefed up after a month-long devastating war in 2006 between Israel and Hezbollah, Lebanon's Iran-backed Shia militia.

The 10,500-strong force, in coordination with the Lebanese army, is tasked with monitoring a ceasefire and Israeli pullout from a demilitarised zone on the border.

Israel accuses Hezbollah of stockpiling weapons at the border to prepare for a new war.

READ MORE: Hezbollah: Israel's claims of border clashes 'completely false'

Source: AFP