six incidents of Israel deploying munitions, including heavy 2,000-pound bombs, along with 1,000-pound bombs and 250-pound bombs in densely populated areas of Gaza, reported with evidence.

Two of the strikes on densely populated areas identified in the U.N. report were in northern Gaza at the Jabalya market and at the Jabalya refugee camp in October. The refugee camp strike alone killed a verified 52 people and damaged or destroyed 20 buildings.
Another three strikes hit a residential area, a neighborhood and a school in Gaza City, all similarly densely populated, according to the U.N., while Israel also allegedly struck a residential block in middle Gaza.

The U.S. had put a preliminary pause on the delivery of 2,000-pound bombs to Israel ahead of a possible assault on Rafah.

Source

The Hill report,

UN says Israel’s use of heavy bombs in Gaza is potential war crime; Israel rejects allegations

The Huffington Post report,

U.N. Report Accuses Israeli Forces Of Carrying Out ‘Extermination’ Campaign In Gaza