Baseball bat
Maugham has been fiercely criticised on Twitter for sharing details of the incident.
Forty-five people were injured by men in white t-shirts armed with baseball bats at Yuen Long station, with one in critical condition.
The discovery was tweeted by PC Paul Glensman of Essex Police.
Just in time for Halloween.
One man has been arrested.
Police were called to reports of men armed with baseball bats.