Police arrested a 53-year-old man of Pakistani origin for allegedly pushing a woman onto the light rail tracks in Yuen Long in the New Territories on Saturday.

Surveillance camera footage, which has circulated on social media, shows the woman, a cleaner aged 59, surnamed Leung, standing on the edge of the Light Rail Yuen Long platform at 10:22am when the suspect came up from behind and pushed her down on to the track with his right hand.

The culprit then calmly walked away from the scene.

No train was passing at that moment and Leung was saved by other passengers. The woman was sent to hospital for treatment and allowed to go home in the evening – she suffered an injured jaw and a broken left arm.

Police arrested the suspect 20 minutes after the attack. He was reportedly found lying on the ground, drunk and swearing at passers-by 100 meters from the station, Ta Kung Pao reported.

The man was arrested for assault occasioning bodily harm and the case handled by officers from the criminal squad at Yuen Long police district, Oriental Daily reported.