BEIRUT An Israeli air strike killed Hezbollah militant leader Samir Qantar in Damascus early on Sunday, the Lebanese group and Syrian state media said.
Israel welcomed Qantar's death, saying he had been preparing attacks on it from Syrian soil, but stopped short of confirming responsibility for the strike that killed him.
A former national security adviser to Israel said he doubted the strike would escalate hostilities between Israel and Iranian-backed Hezbollah, whose last major confrontation was in 2006.
Israel has formally kept out of Syria's civil war which started almost five year ago but has bombed Hezbollah targets there without publicly acknowledging these sorties.
Hezbollah, a powerful Shi'ite Muslim group that has sent hundreds of fighter to Syria to support President Bashar al-Assad against rebels trying to topple him, said Qantar was "martyred" in an Israeli raid on the residential district of Jaramana in the Syrian capital on Sunday, but gave no details.
Jailed in Israel for his part in a 1979 raid in Israel that killed four people, Qantar, a Druze, was repatriated to Lebanon in 2008 in a prisoner swap with Hezbollah, which he is then believed to have joined.
Yaakov Amidror, Israel's former national security adviser, predicted Hezbollah would seek to exact "small revenge" for Qantar's killing, but said Hezbollah, like Iran, was likely too busy fighting in Syria to afford a new front with Israel.
"It would not be in their interest, and if they did so, they would have a big problem," Amidror said, alluding to Israel's threats to respond to any major Hezbollah attack with strikes in Lebanon.
Hezbollah's official media said Qantar would be buried on Monday in a Shi'ite cemetery in its main stronghold of Dahiya in the southern suburbs of Beirut. The party opened a condolences hall to receive the public.
"Such acts of the Zionist regime (Israel), which have become a consistent method, are the most dangerous forms of state terrorism," Iranian Foreign Ministry spokesman Hossein Jaber Ansari was quoted as saying by Iran's ILNA news agency.
Syrian Information Minister Omran al Zubi pointed the finger at Israel but fell short of blaming it directly.
"The party that gains most from the assassination of Qantar is the Zionist enemy whom we have long known for these cowardly attacks," Zubi told Hezbollah's Manar television station.
Official Syrian media said an Israeli aerial strike hit a six-storey residential building in the Jaramana district of Damascus.
"I am not confirming or denying anything to do with this matter," Israeli Housing and Construction Minister Yoav Gallant told Israel Radio, adding: "It is good that people like Samir Qantar will not be part of our world."
Qantar, born in 1962, kept a low public profile after Israel released him. Hezbollah did not say which role Qantar played in the Syrian conflict, but Syrian state media said he was involved in a major offensive earlier this year in Quneitra, near the Syrian Golan Heights.
Rebels in southern Syria also said Qantar was present in battles this year to defend a Syrian air base near the Druze majority city of Sweida, close to the border with Jordan, that rebels sought to capture.
Reuters could not independently verify this.
Israeli Justice Minister Ayelet Shaked accused Qantar of overseeing covert Hezbollah entrenchment on the Syrian Golan Heights, a strategic plateau overlooking northeastern Israel.
"He set up a broad terror network on the Golan, and it is good that he returned his soul to his creator," Shaked told Israel's Army Radio, without elaborating on any Israeli role.
The Assad loyalist National Defence Forces in Jaramana, a bastion of government support and home to many of Syria's Druze minority as well as Christians, mourned Qantar on its Facebook page.
"Two Israeli warplanes carried out the raid which targeted the building in Jaramana and struck the designated place with four long-range missiles," the NDF said.
In January, an Israeli strike in Syria killed six members of Hezbollah, including a commander and the son of the group's late military leader Imad Moughniyah near the Israeli-occupied Golan Heights.
(Additional reporting by Dan Williams in Jerusalem and Suleiman al-Khalidi in Beirut; Editing by Janet Lawrence and Raissa Kasolowsky)
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