A 56-year-old man has been arrested after callously pushing a woman onto train tracks in Hong Kong.
CCTV footage from a train station in Yuen Long shows a 59-year-old female rail worker standing on the platform awaiting a train.
In the clip, which has since gone viral on social media, the man appears to calmly walk behind the woman.
Without any provocation, he then savagely pushes the woman onto train tracks below.
As the sickening attack happened so quickly, the woman was unable to brace herself for the fall.
The cleaner remains motionless on the tracks as the man calmly walks away without a second glance.
Thankfully, there were no trains approaching the station and the woman was rescued from the tracks.
She was taken to hospital with 'injuries to her jaw', the South China Morning Post reported.
A 56-year-old man was later arrested near the railway station on suspicion of the assault.