What is there to investigate? Ethnic cleansing was the plan from the beginning of the UN’s farce of partitioning Palestine. Read:
The UN’s acquiescence to erasing Palestine
Maybe the UN’s stance has not changed, at least rhetorically. However, the UN’s complicity in creating Israel cannot be overlooked. The UN knew it was legitimising a colonial presence in Palestine and that the 1947 Partition Plan, which laid the foundations for the two-state paradigm, would ultimately aid Israel’s expansion plans. Talking about a stance is the weakest possible excuse the UN could come up with when it knows its stance did not prevent Israel from pursuing different forms of ethnic cleansing to eliminate Palestine and Palestinians.
https://www.middleeastmonitor.Com/20230930-the-uns-acquiescence-to-erasing-palestine/