Tokyo police say the suspect who stabbed a university professor on Tuesday may have known the victim's work schedule in advance. The attacker is still at large.

Sociologist and Tokyo Metropolitan University Professor Miyadai Shinji was stabbed by a man at the university's Minami-Osawa campus in the city of Hachioji.

A university employee has been taken to hospital after he was violently attacked at a campus in Tokyo. Investigative sources say the victim is a sociologist and professor at Tokyo Metropolitan University, Miyadai Shinji.

Police received a report at about 4:20 p.m. on Tuesday that a man had been stabbed at the university's Minami-Osawa campus in the city of Hachioji.