The Britain based Syrian Observatory for Human Rights (SOHR) reported Saturday that ISIS has begun an offensive against the northeastern Syrian city of Hasakah.
"IS [ISIS] fighters started an assault on Hasakah city and reached the city's southern periphery, where they are clashing with pro-regime forces," SOHR head Rami Abdel Rahman said.
He reported that the regime loyal National Defense Forces militia had blocked off ISIS’ advance on the city and that heavy shelling was reported by field activists.
His reports were corroborated by the Syrian state news agency SANA which reported that loyalist forces had "foiled a terrorist attack by IS on military points near Hasakah."
Hasakah, home to a majority Kurdish population, is co-run between regime loyal forces and Kurdish People's Protection Units (PYD), the Syrian branch of the PKK, an outlawed group recognized as a terrorist organization by the US, EU and Turkey.
On Friday, PYD forces executed at least 20 civilians, including two children, they accused of being ISIS agents and burned down the houses of others they accused of sympathising with the group near the towns of Ras al-Ain and Tal Tamr, SOHR reported.
ISIS also killed 30 civilians it had captured who were attempting to flee their advance.