Syrian army troops late Sunday regained full control over the violence-hit area of Jisr al- Shughour in north Syria, the official SANA news agency reported.

The army was still hunting down remnants of the armed groups in the mountains and forests in the surroundings of Jisr al-Shughour, said SANA.

It added that army units had uncovered a mass grave which is believed to contain the remains of 120 police and security men, who were allegedly killed by armed groups in the northern area.

Earlier the day, SANA said that army units have entered the area of Jisr al-Shughour under heavy gunfire by armed groups, adding that the army has arrested a large number of gunmen and many others fled the area.

It said the army units have entered the area after dismantling explosives planted by gunmen on roads and bridges, adding that " severe" clashes broke out between the army units and gunmen inside Jisr al-Shughour and its surroundings.

Jisr al-Shughour has witnessed the fiercest clashes in Syria since the eruption of protests in mid-March.