Jeremy Corbyn, leader of the United Kingdom Labor Party and the country’s opposition, called on Friday upon the UK to freeze arms sales to Israel and to condemn it for killing Palestinian civilians in Gaza.

In a tweet, Corbyn said, “The UN says Israel’s killings of demonstrators in Gaza – including children, paramedics and journalists – may constitute “war crimes or crimes against humanity”.

He added that the “UK government must unequivocally condemn the killings and freeze arms sales to Israel.”

Corbyn’s statement came after UN investigators accused Israeli forces of intentionally firing on civilians and committed war crimes in their lethal response to Palestinian demonstrations in Gaza.

The independent Commission of Inquiry, set up last year by the UN’s human rights council, said Israeli forces killed 189 people and shot more than 6,100 others with live ammunition near the fence that divides the two territories.

The panel said in a statement that it had found “reasonable grounds to believe that Israeli snipers shot at journalists, health workers, children and persons with disabilities, knowing they were clearly recognizable as such”.