Don’t know about Iran.
About the UNRWA, google ‘al fakhoora school incident’.
I did a quick look at that, and without going into depth into the account, what I picked up about it is that Islamic terrorists were using the “shelter” of the school (namely being close to it) to fire off their weapons. And if that’s the case, we’ve got lots of examples of Hamas using close proximity to hospitals and schools and other civilian places to shelter them from return fire.
HOWEVER, I saw an IDF video one time, where a terrorist was shooting off rockets from right next to a hospital. He was less than ten feet from the hospital wall and shot off several. But ... boom ... the IDF got him, just in that ten feet from the wall. There was no damage to the building, but he wasn’t there anymore ... LOL ...
Of course, that’s not what I call the UN helping Hamas, though ... :-) ...