Iran-backed armed group Hezbollah launched guided rockets and artillery onto three Israeli posts in the Shebaa Farms "in solidarity" with the Palestinian people.

Israel and Lebanon's armed group Hezbollah exchanged artillery and rocket fire on Sunday following the deadliest attack in years by Palestinian gunmen on Israel. There were no immediate reports of casualties in either Lebanon or Israel from Sunday's exchanges of fire.

On Saturday, a multi-pronged attack by Palestinian gunmen on Israeli towns left at least 250 Israelis dead, with more than 300 Palestinians killed in Israel's retaliatory bombardment.

The Israeli military said on Sunday it fired artillery into an area of Lebanon where cross-border fire was launched. "IDF (Israel Defense Forces) artillery is currently striking the area in Lebanon from where a shooting was carried out," it said.

Israel's military said one its drones struck a Hezbollah post in the area of Har Dov, an area in Shebaa.

"At this point, there is no further threat in Har Dov or the northern arena," IDF spokesperson Daniel Hagari said in televised remarks, adding that the military remained on high alert.

The IDF later said that it fired a warning shot toward a number of "suspects" in the same area in Har Dov.

A Lebanese security source told Reuters that a tent set up by Hezbollah in the Shebaa Farms had been hit and that Hezbollah fighters had erected a new one.

(Report by Reuters)