I find it interesting that Israel is (as far as I can tell) accusing only the UNRWA of improper behavior here. That doesn't mean the accusations are true, but they're definitely focused on who they're pointing a finger at instead just spamming blame anywhere it might stick.

I'm also a cynic and wouldn't be surprised in the least if the UNRWA is being used to funnel more than just humanitarian aid into Palestine. It really does make an excellent cover, because (as demonstrated currently) cracking down on it immediately leads to cries of outrage at the stoppage of aid to those in need.