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A warning before we begin today's show.

This episode contains some graphic descriptions of violence.

On Saturday, February 28th, in the opening hours of the U.S. Israel War in Iran,

a missile slammed into an elementary school in the city of Minab in

southeastern Iran. Saturday is the start of the Iranian workweek, meaning school was likely

underway when the blast tore through the building. Iranian officials say up to 168 people were killed. Most of them, children, between the ages of 7 and 12.

While the U.S. President initially said he thought Iran did it, last week there were reports that U.S. military investigators believe American forces were likely responsible, but that they haven't reached a final conclusion.

From the BBC, I'm Tristan Redmond in Paris.

And I'm Asma Khalid in Washington, D.C.

And today on the global story,

how did this strike on a school happen?

And what questions does this raise about how the U.S. military is waging this war?

Coming up, we'll be speaking to an international law expert who's also advised the U.S. government in the past.

First, though, we want to understand how this all happened.

And to get a better handle on everything we know so far, we reached out to Merlin Thomas, one of our colleagues at BBC Verify.

That's a special unit within the BBC that uses open-source intelligence and satellite imagery

to verify video and fact-check information.

We asked Merlin to wind back the clock to Saturday, February the 28th.

Now, that was the first day of the war.

It was the day Iran's supreme leader was killed.

And it was also the day that that school in southern Iran was

...