Defense Secretary Pete Hegseth today said no nation in the world takes greater care to avoid

civilian casualties than the U.S. But the U.S. is currently investigating an explosion at a school

next to an Iranian Navy base that Iran says killed more than 150 people, mostly schoolgirls.

An official briefed on the initial review tells PBS NewsHour the strike was likely American.

Nick Schiffran examines videos and satellite images and speaks to experts for a closer look at what appears to be the deadliest strike of the war.

In the moments after the attack, the only sounds were screams.

The school where many of these parents had dropped off their children not long before was now collapsed and gutted.

The scale of death clear from the air rose and rows of tiny graves.

Classmates in life and now death, a victim still wearing her backpack.

Like in class, all lined up, a roll call of the dead.

An official briefed on the initial review tells PBS Newsour the strike was likely American.

Video broadcast by the semi-official matter news agency reportedly shows the strike and

slowed down.

Weapons experts say that is an American Tomahawk.

And today, Iranian state media released these photos it said were taken at the site that appeared

to show Tomahawk components.

I could already tell when initial reports came out on this strike, just looking at the damage

that this was a deliberately targeted strike package.

Retired master sergeant West Bryant spent 20 years in the U.S. Air Force, where he called

in air strikes and led targeting cells, and then worked in the Defense Department's

Civilian Protection Center until the Trump administration reduced its size.

Bryant says this satellite image from after the attack shows six precise strikes inside

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