''The trio was playing Ludo game on a mobile phone. During the game, one of them nudged another player with his elbow, which triggered an argument between them. The twin brothers then started bashing up the fellow passenger,'' the official of Borivali Government Railway Police (GRP) said.

Someone from the compartment shot a video of the incident and circulated it on social media.

During the probe, Borivali police found that all the three passengers involved in the incident are residents of Nalasopara and Bhayandar areas located in the Mumbai metropolitan region.

''They were travelling from Bhayandar to Churchgate,'' he said.