The Israeli army claimed the Lebanese resistance group Hezbollah fired the rocket that killed the youngsters aged between 10 and 20 years when they were hit on the pitch in the town of Majdal Shams.

Many residents of the town retain Syrian nationality decades after the territory's occupation in the 1967 Arab-Israeli war.

The rocket fire came after an Israeli strike killed four Hezbollah members in southern Lebanon village of Kfar Kila. prompting the group to announce a flurry of retaliatory rocket attacks against the Golan and northern Israel.

The Israeli army spokesman Daniel Hagari said on X that 11 people were killed in the attack, while the emergency service Magen David Adom said 19 others were wounded.

"We will prepare for a response against Hezbollah... we will act," Hagari said in a video statement.

Israel's Prime Minister Benjamin Netanyahu, who was returning early from a visit to the United States, vowed that Israel will not let this attack "go unanswered".

"Hezbollah will pay a heavy price for it, a price it has not paid before," he warned in a statement released by his office.

Hezbollah denied it was responsible for the strike.

"The Islamic Resistance has no connection to this incident," it said.

The police and the army claimed the rocket fired at Majdal Shams was part of a barrage of rockets fired from Lebanon which struck multiple locations in the Golan.

Ambulances, helicopters and mobile intensive care units were deployed to the scene, the army said.

An AFP correspondent saw medics carrying away the wounded for treatment.

"Officers and police bomb disposal experts from the northern district police are currently securing the area and searching for additional (rocket) remnants to eliminate any further risk to the public," the police said in a separate statement.

The near-daily cross-border fire since the Israeli war on Gaza started, has killed at least 527 people in Lebanon, according to an AFP tally. Most of the dead have been fighters, but they have included at least 104 civilians.

On the Israeli side, 18 soldiers and 24 civilians have been killed, according to Israeli authorities.

Israel has killed at least 39,258 people in Gaza since October, mostly women and children, and has wounded over 90,589 others.