A 20-year-old man has been arrested in connection with a stabbing incident aboard a TTC subway train that left a rider with serious injuries.

Police had been looking for the suspect since Wednesday night, when they say a Toronto man riding southbound on the Yonge-University-Spadina subway line was stabbed as the train approached Davisville station.

The suspect had been walking through the train and bothering passengers before he started talking to the victim, who was sitting alone.

Moments later, the victim was slashed across the neck when he stood up and told the suspect to leave him and others alone, police said.

According to police, the passenger-assistance alarm was then activated by another passenger and the suspect fled the train, which had stopped at Davisville Station.

The 35-year-old victim was taken to hospital for treatment of serious, but non-life threatening injuries.

On Thursday, police released a series of images of the suspect, taken from closed-circuit camera video.

Drummond said assistance from the public helped police track down the suspect, who was arrested without incident at approximately 10 a.m. in an undisclosed location.

He is scheduled to appear in a downtown court later today, Drummond said.

Cassim Celani Cummings, 20, faces a total of seven charges including attempted murder, two counts of failing to comply with probation, carrying a concealed weapon, aggravated assault, assault with a weapon and possession of a dangerous weapon.

Police suspect Cummings is also behind several unprovoked attacks throughout the city, and he may face additional charges.

In an interview with CTV News, Cummings’s mother described her son as “sick,” saying she had made an application to the courts in December requesting that they place him into a mental health institution if they located him.

Police on Friday said they were aware of the order but could not provide further details.

“This is what it comes down to, this is what it comes down to. The system failed him over and over and over,” said the mother, who did not wish to be identified.

With a report from CTV Toronto's Natalie Johnson