An "armed terrorist group" early on Saturday shelled some fuel tankers at a refinery in central Syria's Homs, setting ablaze a tanker that contains more than 50 million liters of gasoline, the official SANA news agency reported.

According to SANA, civil defense workers have put out the fire, but no immediate reports are available about whether any casualties were caused by the attack.

The assault came a day after an oil pipeline in Homs was targeted with explosives for the second time in a week.

Meanwhile, in the northern province of Idlib, a law-enforcement agent was killed and some other forces were wounded when a booby- trapped car was detonated on Saturday by an armed group in Ariha area, SANA said.

The Syrian government has blamed the unrest in Syria on plots by terrorists and foreign-backed armed gangs, and said more than 2, 000 army and security personnel were killed during the past months, while the UN put the death toll in the Syrian unrest at around 6, 000.