WASHINGTON — A US government agency is “expanding” its probe into more than 100 officials at a UN relief agency who had links to Hamas or were participants in the terror group’s Oct. 7, 2023, attack that killed dozens of Americans, The Post has learned. The Office of the Inspector General for the now-defunct US Agency for International Development continues to uncover ties to terrorism at the United Nations Relief and Works Agency for Palestine Refugees in the Near East, according to a US