Yeah,...I saw that too.
It was probably a drone attack.
Israelis can't stand to see a big herd of Palestinians huddled together without dropping a big chunk of ordnance in the middle of 'em.
Some Palestinian was filming the whole thing and put it out there for consumption.
The Israelis saw it and started talkin' 'bout,.."Looky here! They done blowed themselves all to hell and gone!"
,..and of course,...Americans believe whatever the Israelis tell them.
So we get threads like this.