A Syrian Kurdish militia is using child soldiers despite international law prohibiting its practice, Human Rights Watch said on Wednesday.
The New York-based body said it documented at least 59 children under 18 recruited by the People's Protection Units (YPG) militia and the YPJ, its female branch.
Some of the children died in combat in June, it said.
“The YPG promised to stop sending children to war and it should carry out its promise," said Fred Abrahams, a special adviser at Human Rights Watch (HRW).
“Of course the Kurdish forces are fighting groups like ISIS that flout the laws of war, but that’s no excuse to tolerate abuses by its own forces," he added.
As the armed branch of the Democratic Union Party (PYD), the YPG has a sizable presence in Syria's north and has been backed by US airstrikes in a conflict that has killed more than 230,000 people and forced almost four million to flee the country.