A Hong Kong MTR worker was stabbed in the neck with a syringe on Saturday when checking the ticket of a suspected fare dodger.
The rail operator said members of staff at Kwai Fong station were talking to a person they believed had used the wrong ticket to pass through a gate at about 5.15pm.
A statement from the MTR Corporation said: "When they were handling the incident, one of the colleagues was stabbed by a syringe to the back of his neck by another person.
"That person jumped over the turnstile and fled the station … The company condemns the attack on our colleague."
Police said the injured worker was sent to Princess Margaret Hospital in Kwai Chung and classified the case as assault occasioning actual bodily harm.
The embattled rail firm emerged as a target of radical protesters in August - two months after anti-government demonstrations broke out last summer in fury over the now-withdrawn extradition bill - after they accused the MTR Corp of bowing to Beijing pressure following a scathing attack from mainland Chinese media on the transport giant.
Radical protesters trashed railway stations and set facilities on fire, while hurling petrol bombs at entrances, spray-painting graffiti on walls, and throwing objects onto the tracks.
This article was first published in South China Morning Post.