Tokyo residents are being asked to refrain from wearing spooky costumes on the city's train network after a man killed one and injured 17 while on a rampage dressed as The Joker last year.
Just after 8pm on Halloween 2021, a 24-year-old male passenger clad in a purple suit, green shirt and necktie boarded a Keio Line express train in Tokyo.
As the service pulled up at Chofu station, towards the outskirts of the sprawling city, the man knifed an elderly woman, 72, in the chest with a 12-inch blade.
