The Japanese Wikipedia article on actress Aya Ueto (23) has been locked from editing after someone posted a bomb threat, it was learned on Thursday.

The message declared that explosives would be used to kill everyone attending an Aya Ueto event on August 31, apparently referring to her "Happy Magic" event at Odaiba's Zepp Tokyo. That event will be her first live concert in close to two years.

Tokyo police are investigating the matter and have warned the event's organizer to increase security. Criminal charges may be brought against the person responsible for the threats.