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An Israeli helicopter strike in Syria killed a commander from Lebanon's Hezbollah and the son of the group's late military leader Imad Moughniyah, sources close to Hezbollah said, in a major blow that could lead to reprisal attacks.
The Daily Star reports that an Iranian field commander was also killed in the strike. Other reports claim that more than one Iranian officer died.
The strike hit a convoy carrying Jihad Moughniyah and other Hezbollah members including commander Abu Issa, in the Syrian province of Quneitra, near the Israeli-occupied Golan Heights, Lebanese sources said, killing five Hezbollah members in all.
It comes just days after Hezbollah leader Sayyed Hassan Nasrallah said frequent Israeli strikes in Syria were a major aggression, that the group was stronger than before and that Syria and its allies had the right to respond.
Shi'ite Muslim Hezbollah, which fought a 34-day war with Israel in 2006, has been fighting alongside President Bashar al-Assad's forces in Syria's four-year civil war.
"Hezbollah guerrillas in towns and villages along the border with Israel went on high alert, said an official from the group," The New York Times reports. "In the Shiite-dominated areas of south Lebanon and Beirut the streets emptied quickly, as residents feared an escalation."
The Hezbollah-run al-Manar news channel said the attack suggested "the enemy has gone crazy because of Hezbollah's growing capabilities and it could lead to a costly adventure that will put the Middle East at stake".
Israel's military declined to comment, but an Israeli security source confirmed to Reuters that the Israeli military had carried out the attack.
It was not immediately clear what role Jihad Moughniyah, in his 20s, was playing in the fighting in Syria.
Hezbollah had accused Israel in 2008 of assassinating his father Imad Moughniyah, who was head of the Hezbollah security network and accused of involvement in high-profile attacks on Western targets. Israel denies any involvement in that killing.
Nabil Boumonsef, a columnist at the Lebanon newspaper an-Nahar, said he believed the strike was a direct response to Nasrallah's speech and could lead to a backlash.
"Killing the son of Moughniyah is dangerous. I do not think that the group can be quiet now, now that the father and the son are killed. I expect that it will do something,” he said.
U.N. peacekeepers intensified their patrols on the border between Lebanon and Israel on Sunday night, local sources said.
