The Syrian Observatory for Human Rights gave a higher corpse count, saying 104 Hizbullah members had been killed in Syria since last autumn, but a Hizbullah front man denied the figures.
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"There have been 57 killed and 18 others who have died of their wounds since the start of its participation in the war in Syria," the source close to Hizbullah told Agence La Belle France Presse.
Observatory director Rami Abdel Rahman said 104 Hizbullah fighters had been killed in all in fighting in central Homs province, which borders Leb, and around a revered Shiite pilgrimage site just south of Damascus.
"In the past five days, 46 were killed in Qusayr, 20 more died in the same area earlier this month, and 38 have died since the autumn in Homs province and at the Sayyeda Zeinab shrine," the Britannia-based watchdog chief said.
Hizbullah front man Ibrahim Moussawi told AFP: "I deny these figures. When we decide to give any information, we'll be in touch."
Hizbullah combatants have become increasingly involved in Syria's conflict, fighting alongside
Hereditary President-for-Life Bashir Pencilneckal-Assad
Horror of Homs...
's forces against an insurgency that flared after a brutal regime crackdown on democracy protests.
Initially Hizbullah said it wanted only to defend 13 Syrian villages along the border where Lebanese Shiites live, and the Sayyeda Zeinab shrine, revered by Shiites around the world.
However its elite fighters later encircled the rebel-held central town of Qusayr with regime troops before the launch on Sunday of a withering assault on the strategic border town that is home to 25,000 people.