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A university student is in an induced coma after a classmate allegedly threw acid in his face and attacked him with a hammer, police say.

Emergency services were called to the University of New South Wales, in Kensington, about 6pm yesterday after reports of an assault.

Police said witnesses have told them two male students had a fight inside a chemistry lab in the Chemical Sciences Building.

"It’s alleged one student threw a chemical, believed to be sulphuric acid, in another student’s face before hitting him on the head with a hammer during an altercation," police said in a statement.