Toronto police have identified a teen who died on Thursday in a violent shooting which left three others wounded in the area of Jane Street and Highway 401.

Nineteen-year-old Aeon Grant was taken to hospital just before midnight on Thursday with injuries stemming from a gunshot wound. He died as a result of the injuries on Friday.

Police had been called after gunshots were heard in a 15th floor apartment.

Multiple "persons of interest" have been taken into custody though no charges have been laid, according to Insp. Howie Page.

The three other victims are believed to be in their teens or early 20s. They are all in hospital being treated for serious injuries.

While Aeon was being treated by emergency crews, police received a report that a man had stumbled into the Humber River Regional Hospital with serious but non life-threatening gunshot wounds.

Investigators believe the teen was also shot outside Falstaff Avenue.

A short time later, police received a call about two more shooting victims found lying on the ground in a plaza parking lot, blocks away from the original shooting location at Jane Street and Beverly Hills Drive.

Police believe the men ran away from the shooting scene on Falstaff and collapsed in the parking lot.

Authorities are not saying how many guns were used in the shooting or what may have led to the violent outburst.

Grant is Toronto's 55th homicide victim this year.

With files from the Canadian Press