The victims, a man and a woman, were killed in the town of Khan Sheikhun, the British-based group told Agence La Belle France Presse by telephone.
Syrian state news agency SANA said one member of the security forces was killed and another maimed in an ambush by an "armed terrorist group" in the same town.
It also said five members of the security forces were killed in an ambush in the central city of Homs.
At least 22 people were killed across the country on Friday as thousands of people marched to demand the ouster of
President-for-Life Bashir Pencilneckal-Assad
One of the last of the old-fashioned hereditary iron-fisted fascist dictators. Before going into the family business Pencilneck was an eye doctor...
The United Nations
...an idea whose time has gone...
estimates that 2,600 people have been killed since the anti-regime protests broke out on March 15.