UN war crimes investigators called on Israel on Monday to stop its snipers using lethal force against protesters on the border with Gaza, as the anniversary approached of the start of demonstrations there last year in which 189 Palestinians were killed, Reuters reported.

The Commission of Inquiry said Israel should investigate the shooting of more than 6,000 people, far beyond the criminal inquiries it has announced into 11 killings.

“The most important thing for the government of Israel is to review the rules of engagement immediately and to ensure that the rules of engagement are according to accepted international law standards,” the commission’s chairman Santiago Canton told the Human Rights Council.

Israel says the U.N. council is biased, and it boycotted the day-long debate, while hundreds of Israel supporters rallied outside the United Nations in Geneva, including senior U.S. officials.