Two car bombings have killed 26 people in a predominantly Kurdish city in north-eastern Syria, the country's state-owned media and activists reported.
Among the victims of the explosions in the city of Hassakeh were a woman and her two children and several Kurdish fighters, according to the Britain-based Syrian Observatory for Human Rights.
The Islamic State group said in a statement that its two suicide bombers targeted a gathering of Kurdish fighters and pro-regime militias.
The bombers struck in two different Hassakeh neighbourhoods. State news agency SANA said at least 21 died in the bombing in the busy Mahatta neighbourhood. Bodies were pulled from under the rubble of a collapsed building, the agency said, adding that the number of victims was likely to rise.
The second bomber detonated his explosives-laden vehicle in the Khashman district on Hassakeh's northern outskirts, killing five people, including the woman and her children, SANA said.
Syrian state TV broadcast footage from the two-storey building that collapsed in the Mahatta explosion, which also left a large crater in the street. The TV later said that authorities dismantled two other car bombs in the province.
The Observatory, which has a network of activists on the ground, said those killed included 13 civilians, six Kurdish fighters from the local police force and seven pro-government militia members. The group said the first attack targeted a Kurdish police force while the second hit a base for a pro-government militia.
In a statement posted on social media, IS said two of its fighters blew themselves up, one at a graduation ceremony for Kurdish cadets and the other at a base for the pro-government militia.
Hassakeh has been scene of repeated attacks by IS militants. Syrian Kurdish fighters are largely in control of the city, which has pockets of government forces. IS militants have been battling the Kurdish forces and government troops in the province for months.