Police say a law firm that has an office in the complex reported shortly before noon on Tuesday that one of its employees was stabbed by a man brandishing a knife.
The man turned himself in to the police after the incident and was arrested on suspicion of attempted murder. He was reportedly carrying a knife.
Ikebukuro is a busy commercial district in Tokyo’s Toshima Ward. Sunshine City is a business and leisure complex with offices, shops and an aquarium.