A UN fact-finding mission on Iran said on Thursday it had reasonable grounds ​to believe the United States was behind two military strikes on a school and sports facility in Iran in February, and that ‌these constituted war crimes.

It also found that Iranian authorities committed crimes against humanity during their deadly crackdown on anti-government protests.

The findings in a new report by the Independent International Fact-Finding Mission on Iran, to be submitted to the UN Human Rights Council in Geneva, examined the US’s conduct during the Iran war that began in February and the Iranian government’s response to nationwide ​unrest that began in late December.

The Iranian and US permanent missions in Geneva did not immediately respond to Reuters requests for comment.

US officials ​have previously said military operations are conducted in accordance with the law of armed conflict, while Iran has consistently rejected ⁠allegations of systematic rights violations.

Minab school strike

The UN experts said they found reasonable grounds to believe US forces were responsible for an attack on the Shajareh Tayyebeh ​Primary School in the city of Minab, where more than 150 people were killed, including around 120 schoolchildren, according to Iranian officials.

The attack constituted an indiscriminate attack causing ​civilian deaths and damage to civilian infrastructure, amounting to a war crime under international law, the mission concluded.

According to the report, the US relied on intelligence suggesting a senior Iranian military commander was present at the site but failed to adequately verify the information before launching the strike. Investigators said the failure to update targeting intelligence and confirm the building was ​a military objective amounted to more than mere negligence.

“Rather, the US directed the strikes at the building of the school while being aware of a ​substantial risk of striking a civilian object and acting recklessly as regards the possibility that this would happen.”

Also Read: US at fault in deadly strike on Iran school that killed dozens of girls, says inquiry

In June US President Donald Trump said that “nobody” purposefully attacked a girls’ school ‌in Iran ⁠in February, citing an investigation into the incident. Reuters first reported that an initial internal US military investigation showed US forces were likely responsible for the fatal strike in Minab in southern Iran.

The Pentagon has since elevated the probe but it has not published any preliminary findings.

UN experts said the school was a clearly identifiable civilian object and found no evidence that it was being used for military purposes.

The experts reached a similar conclusion over a strike on a sports centre in Lamerd. ​The report said the attack damaged nearby ​residential buildings and a school and ⁠killed and injured 22 civilians. It concluded that the strike was indiscriminate and therefore constituted a war crime.

US Central Command said in a statement in March that US forces did not launch any strikes into the city of Lamerd on ​that day.

Iran abuses

The UN mission probe found that the Iranian authorities carried out a widespread and systematic attack ​against civilians during protests ⁠that erupted in late December last year, involving unlawful killings, torture, arbitrary detention, enforced disappearances and severe restrictions on freedom of expression.

Rights groups say bystanders were among those killed during the biggest crackdown since Muslim clerics took power in the 1979 revolution. Tehran blamed “terrorists and rioters” backed by exiled opponents and foreign foes, the US and ⁠Israel.

The probe said ​it could not independently verify the death toll, but that it believed the number of ​dead and injured was likely far higher than official figures which say 3,038 people were killed, and 25,000 people injured.

The government’s response to the protests – including violence and killings, cutting off the internet ​and the use of the death penalty- marked a significant escalation from previous patterns of suppressing dissent, the report said.