During the 2023 Israel-Hamas war one of the hostages said after having been freed that he had been held in a house of a UNRWA teacher. UNRWA said that it is aware of the claims and is investigating it.[144] Additionally, teachers and other educational staff of UNRWA have been reported praising Hamas’s terrorism on social media, referring to it as an “unforgettable glorious morning” and a “splendid sight.”[145][146][147] The IDF uncovered assault rifles, ammunition, grenades and missiles with varying capacities of Hamas, hidden in and underneath UNRWA institutions.[148][149][150][151]
https://en.wikipedia.org/wiki/UNRWA

This reminds me of the constant denials by haters of Israel regarding the rocket attack on the hospital.

Lots more evidence of the connection between UNRWA and Hamas in that Wikipedia article.