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Three Columbia University deans, who engaged in what the school's administration called troubling "text message exchanges" that touched on "ancient antisemitic tropes," have resigned, a university spokesperson said late on Thursday.

Cristen Kromm, former dean of undergraduate student life; Matthew Patashnick, former associate dean for student and family support; and Susan Chang-Kim, former vice dean and chief administrative officer, were earlier placed on leave as an investigation proceeded.

The message exchanges took place during an event on campus titled "Jewish Life on Campus: Past, Present, and Future" and followed weeks of protests at Columbia and other campuses around the country over Israel's deadly war in Gaza and the university's ties to Tel Aviv, the university administration said in July.

"This incident revealed behavior and sentiments that were not only unprofessional, but also, disturbingly touched on ancient antisemitic tropes," the university said in July.

The three deans who resigned could not be contacted. The university spokesperson who confirmed their resignation did not provide further details.

The United States has seen months of protests over US support for Israel's war in Gaza that has killed about 40,000 Palestinians while also displacing nearly the entire population of 2.3 million and causing a hunger crisis.

Israel's assault on Gaza has also led to genocide allegations at the International Court of Justice.

Campus demonstrators have demanded an end to the war, a halt to US military support to Israel and a divestment by universities in companies that support Israel's occupation of Palestinian territories.

There have been allegations of Islamophobic and antisemitic rhetoric in some protests and counterprotests.

Columbia itself became a center of protests where students set up encampments and police made violent arrests.