A Chuo University electronics professor died of stab wounds Jan. 14 after he was attacked by a man in a building on the Korakuen campus in Bunkyo Ward, Tokyo, police and other sources said.

The culprit, dressed in black clothing and a black knit cap, fled the scene, according to the student who found the professor. The man appeared to be in his 30s, the police said.

Hajime Takakubo, 45, of the Faculty of Science and Engineering, was found bleeding from multiple wounds in a bathroom on the fourth floor of the university's No.1 building. He has been stabbed at least 10 times in the chest, back and hands.

A security guard called authorities at around 10:30 a.m., but Takakubo died an hour later, the police said.

The attacker was seen fleeing the building. No weapon has been found, the police said.

Takakubo, whose office is on the same floor as the attack, was scheduled to give a lecture at 10:40 a.m. He was an expert on electronic circuits for TVs and mobile phones.