Another day of relentless violence in Syria coincided with more unity talks in Qatar among opposition factions.
An Islamist suicide car bomber killed at least 50 Syrian security men in Hama province on Monday, an opposition group said, in what would be one of the bloodiest single attacks on President Bashar al-Assad's forces in a 20-month-old uprising.
Syrian state media reported that a suicide bomber had targeted a rural development center in Sahl al-Ghab in Hama province, but put the death toll at two.
Rami Abdelrahman, head of the Syrian Observatory for Human Rights, said the center was used by security forces and pro-Assad militia as one of their biggest bases in the area.
"A fighter from the Nusra Front blew himself up," he said. "He drove his car to the center and then blew himself up. A series of explosions followed. At least 50 were killed."
The Nusra Front, an al Qaeda-inspired group of ultra-orthodox Salafi Muslims, has claimed responsibility for several suicide bombings in Damascus and elsewhere in the past. It operates mostly independently of other rebel factions, some of which have criticized it for indiscriminate tactics.
The state news agency SANA said: "A terrorist blew himself up in the center which resulted in a number of casualties. Two citizens were killed and a number of them were wounded."
Syrian officials often blame foreign-backed Islamist militants for the anti-Assad revolt, in which about 32,000 people have been killed.
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