The report here
The unfortunate report by Amnesty accused Syria Kurdish forces of “war crimes”
The “documented cases” are at best violations in a heavy fight against IS but not war crimes. A previous widely circulated accusation was explicitly based on pro-IS sources. This report seems to be better produced but it is in the same line of black propaganad. Statements of some villagers who might be affiliated with anti-Kurdish and anti-Asad forces or some satellite imagery that might mean nothing in a state of civil war are used as main evidence.