ISIL Takfiri terrorists have reportedly seized two districts in the northeastern Syrian city of Hasakah.
According to the so-called Syrian Observatory for Human Rights on Thursday, the terrorists entered the city after heavy clashes with Syrian forces and are now in control of two southern neighborhoods.
Dozens were killed on both sides in the fighting, which happened overnight on Wednesday.
The UK-based group said heavy fighting is now underway in the city and civilians in the captured areas are fleeing to safety.
However, a Syrian military source denied the report, saying the army had repelled the attack.
The Takfiri group has also reportedly re-entered the Syrian border city of Kobani, also known as Ain al-Arab.
According to the group, the ISIL offensive against Kobani started with a car bomb attack in an area near the border crossing with Turkey.
The Observatory said dozens of people were killed or injured in the bombing and subsequent fighting.
Earlier in January, Syrian Kurdish fighters took full control of Kobani from the ISIL Takfiri terrorists following more than four months of fighting, during which the terrorists suffered a string of defeats.
In September 2014, the ISIL militants captured some 300 Kurdish villages near Kobani and thrust into the town itself. Tens of thousands of refugees spilled across the border into Turkey.