There have been a number of massacres of the refugees held in those camps for seventy years by their Arab jailers.
They were all committed by various Arab militia.

Bedouin are not "ethnic cleansed" in Israel.
Unlike the Egyptian Bedouin, they have full citizenship rights and protection under the law, and they are a thriving community.
They are the fastest growing population group in the whole world.

Israel has never used chemical weapons on anyone.