A suicide bomber attacked the offices of YPG militants in the northeastern Syrian city of Qamishli on Wednesday, killing at least 11 and wounding 29 others, the Syrian Observatory for Human Rights (SOHR) said.
The attack took place near the Turkish border, targeted offices belonging to YPG militants.
ISIS claimed responsibility for the attack in a statement naming the suicide bomber as Abu Mohamed al Ansari, saying he had detonated a tanker truck.
Reuters report that two militants died in the attack alongside ten others.
YPG militants in northern Syria backed by the US-led coalition air strikes seized wide areas of territory from ISIS this year.
More than 50 people, most of them children, were killed in an explosion resulting in a fire at a clinic in a neighbourhood of Qamishli city north of Hasakah city at the beginning of last June, after ISIS attacked pro-regime security branches in the city with mortar shells.
Fierce confrontations between the YPG and ISIS took place in the city of Hasakah as ISIS tried to capture the city, but the YPG repelled their attack. The YPG is the Syrian branch of the outlawed PKK, which is recognised as a terrorist organisation by Turkey, as well as the NATO, US, and EU.