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Two Syrian sisters were murdered at a for people linked to the (IS) group in northeast Syria, the security forces controlling the area said on Monday.

The 17-year-old girl and 23-year-old woman were murdered at , the Syrian Democratic Forces (SDF) said.

witnesses two more murders - has killed two sisters, aged 17 and 23. continues to strive to maintain security and to bring to justice.

— Coordination & Military Ops Center - SDF (@cmoc_sdf)

There have been dozens of murders at Al-Hol this year. Most of those killed have been Iraqi or Syrian, the two nationalities that make up the bulk of the population at the camp.

Human rights organisations and the United Nations have condemned conditions at the camp. They have also urged countries to take back citizens, trying adults for their crimes, and rehabilitating children.

Northeast Syria’s Kurdish-led authorities have said that they are unable to handle the camp long term, warning of an IS resurgence among residents.

A Canadian woman was released from the nearby Roj camp where IS-linked individuals deemed to be of lower risk are held, Ottawa confirmed on Monday.

Her four-year-old daughter was repatriated from northeast Syria in March after the mother relinquished custody.

The two are exceptions, with over 30 IS-linked Canadians still in northeast Syria detention facilities, according to Human Rights Watch data.

At a conference for the US-led Coalition to defeat IS, the US Secretary of State urged European countries to speed up repatriations from the camp.

"This situation is simply untenable. It just can't persist indefinitely," Blinken said in Rome on Monday.

"The United States continues to urge countries - including coalition partners - to repatriate, rehabilitate and, where applicable, prosecute its citizens.” 

SDF commander Mazloum Abdi on the eve of the conference for countries to take back all citizens.