Airi Sato, 22, was rushed to a hospital with critical injuries after the attacker stabbed her repeatedly in her upper body, police said, and was later pronounced dead.

Police in Japan have charged a man with the murder, saying he was a follower who had tracked her location by the buildings behind her as she filmed herself.

Witnesses and livestream viewers said they heard Ms Sato screaming for help during the attack in the Japanese capital on Tuesday.