Sessions of an online meet-and-greet event that were scheduled later in the day were canceled.
The 44-year-old event worker was stabbed in his chest when he cautioned a man, who the police believe was Yamaguchi, in the elevator hall of a VIP parking area of the stadium.
The other victim is a 27-year-old woman from Kurashiki, Okayama Prefecture, who was visiting for a live event held by a male idol group at the stadium.
She suffered a wound to her back, having gone to Boss E.Zo Fukuoka to meet a friend.
According to the police, Yamaguchi called the police at 2 a.m. Monday from a pay phone in Kasuga, a city adjacent to Fukuoka. He initially called to report he had seen the suspected attacker, but later confessed that he was the one who fled from the scene of the incidents before hanging up.
The police apprehended Yamaguchi later Monday and found him in possession of two knives. They suspect at least one was used in the attacks.
