The security forces have also foiled infiltration attempts by terrorists from Jordan, reports say.
In Aleppo, there has been fierce fighting in the southwestern neighborhoods of Salahuddin and Hamdaniya and the eastern neighborhood of Sakhour.
The Syrian army began a major operation on Saturday from the southwestern outskirts of Aleppo to clear the city of armed gangs.
Meanwhile, nearly 150 militants were killed during clashes with Syrian troops in the suburbs of the western city of Homs on Sunday.
Over the past few days, Syrian troops have reportedly inflicted heavy losses on militants in the southwestern city of Dara’a, about 114 kilometers (70 miles) south of the capital, Damascus.