The deadly strike on an elementary school in Minab, Iran, which killed at least 175 people — mostly children — was the result of a US missile strike, the New York Times reports.

According to the paper's sources, the tragedy occurred due to outdated targeting data, causing US bombs to hit a school complex that had previously been part of an adjacent Iranian military base.

This is considered the deadliest single incident of the US-Israeli war against Iran and was characterized by UNESCO as a "grave violation" of international law. The majority of victims were girls aged 7 to 12.

According to the NYT, the target coordinates for the strike were determined by US Central Command based on data provided by the Defense Intelligence Agency (DIA). The report notes these are preliminary findings and questions remain as to why the outdated data was not cross-checked.

On Saturday, President Trump said responsibility for the attack lies with Iran. "In my opinion, based on what I've seen, it was done by Iran… Their munitions, as you know, are extremely inaccurate. They have no precision. They did it," Trump said, providing no evidence for his claim. His assertion was not confirmed by US military officials, who only said an "investigation" into the incident is underway.