The moment passengers attack others on board train
Footage shot on board a train shows the moment two passengers rain blows on other commuters during a sustained attack in the middle of a busy carriage.
In video posted on social media, a woman leads the beating of a female passenger and man after accusing them of throwing food at her.
British Transport Police (BTP) said it believed the footage related to an incident on a Chiltern Railways service travelling between London and Birmingham on Monday night.
A BTP spokesperson said an investigation was under way.