I think it's likely that the explosion was caused by a US strike. But we don't actually know for sure that that's what happened - the US government has not confirmed it.

We also don't know anything about casualties - we only have the IRGC statements, and they are not reliable.

> Have those investigations been launched?

Yes, according to the US government, an investigation is underway. But its starting point is determining what caused the explosion.

How long does it take to look at the coordinates programmed into the cruise missiles? Or to review existing satellite imagery for the location and other intelligence sources?

If this was a school (which seems likely at this point) and if this was a US TLAM that hit it (which also seems likely at this point) then we should expect a lot of casualties when it's hit during school time (which also seems likely). And yes, we shouldn't trust what the IRGC is saying.

I think I'm on your side but in this case the correct course of action for the US would have been to quickly own up to the mistake. There is really not a lot of ambiguity here. This doesn't seem to be a case like "shots were fired from the school window" or some sort of dual use with IRGC having offices in the school. If there was a reason for the targeting then presumably we'd have a statement about it already.

Mistakes can be made and are always made in war. Leaving this open like this is damaging to the war effort.

>> the US government has not confirmed it

What have they done to deserve your trust? They started a war that they deny is a war. They told us a year ago they set Iran back a decade. Then they tell us 9 months later they're weeks from a nuclear bomb. I wouldn't trust the warmongers to admit they're child killers.