An Israeli professor at City St George’s, University of London, says he was threatened with beheading by a pro-Palestinian protester who disrupted his lecture this week.

Professor Michael Ben-Gad, an economics lecturer who served in the Israel Defense Forces from 1982 to 1985, told Sky News that masked activists burst into his classroom, calling him a “war criminal” and “Nazi.”

“They refused to leave. They were masked. One of them made a threat about having my head chopped off,” he said.