Israeli aircraft strikes Hezbollah targets after Golan Heights attack

Israeli aircraft carried out attacks against Hezbollah in Lebanon overnight, the Israeli military said on Sunday, after a rocket that it said the group fired at a football pitch killed 12 people, including children.

"Overnight, the IAF struck a series of Hezbollah terror targets both deep inside Lebanese territory and in southern Lebanon, including weapons caches and terrorist infrastructure in the areas of Chabriha, Borj El Chmali, and Beqaa, Kfarkela, Rab El Thalathine, Khiam, and Tayr Harfa," the military said.

Hezbollah denied any responsibility for the strike on the football pitch, the deadliest in Israel or Israeli-annexed territory since the start of the conflict in Gaza.

The attack sharply escalated tensions in the hostilities which have been fought in parallel to the Gaza war and has raised fears of a full-blown conflict between the heavily armed adversaries.

The rocket struck a pitch in the Druze village of Majdal Shams in the Israeli-occupied Golan Heights, territory captured from Syria by Israel in the 1967 Middle East war and annexed in a move not recognised by most countries.

"Hezbollah will pay a heavy price, the kind it has thus far not paid," Prime Minister Benjamin Netanyahu said in a phone call with the leader of the Druze community in Israel, according to a statement from his office.

In a written statement, Hezbollah said "(it) has absolutely nothing to do with the incident, and categorically denies all false allegations in this regard".

Hezbollah had earlier announced several rocket attacks targeting Israeli military positions.

The Israeli ambulance service said 13 more people were wounded by the rocket that hit the soccer pitch which was filled at the time with children and teenagers.

"They were playing soccer, they heard sirens they ran to shelter...it may take them like 15 seconds (to reach the shelter). But they couldn't reach the shelter because the rocket hit the site between the ground and the shelter," said Mourhaf Abu Saleh, a witness.

Footage posted on social media showed the moment the rocket hit. An air raid siren can be heard, followed by a big explosion and images of smoke rising. Reuters was able to independently verify the location with the buildings and road layout that matched the satellite imagery of the area.

Idan Avshalom, a medic with the Magen David Adom ambulance service, said first responders arrived to a scene of great destruction. "There were casualties on the grass and the scene was gruesome," he said.

Netanyahu, already due to head back from the United States to Israel overnight on Saturday, said he would bring his flight forward and convene his security cabinet upon arrival.

The United States, which has been leading diplomatic efforts aimed at de-escalating the conflict across the Lebanese-Israeli border, condemned it as a horrific attack and said US support for Israel's security was "iron-clad and unwavering".

The United States "will continue to support efforts to end these terrible attacks along the Blue Line, which must be a top priority," the spokesperson for the White House National Security Council said in a statement. The Blue Line refers to the frontier between Lebanon and Israel.

US Secretary of State Antony Blinken said he does not want to see an escalation of conflict and said the US was in talks with Israel about the incident.

Moscow, which has ties with most of the key players in the Middle East, including Israel, Iran, the Palestinian Authority and Hamas, condemned the attacks.

Iran warned Israel on Sunday against what it called any "new adventure" in Lebanon, in a statement issued by foreign ministry spokesperson Nasser Kanaani.

The Lebanese government has asked the US to urge restraint from Israel, Lebanon's foreign minister Abdallah Bou Habib told Reuters. Bou Habib said the US had asked Lebanon's government to pass on a message to Hezbollah to show restraint as well.