It was a violent Halloween in the Greater Toronto Area this year as a triple stabbing and multiple shootings marred the holiday.

The chaos occurred during widespread power outages throughout the City of Toronto caused by strong winds that dislodged branches and damaged power lines.

At around 11:40 p.m. Thursday, police were called to a "rowdy party" with at least 200 attendees in a fraternity house near the corner of Madison and Lowther avenues in midtown Toronto.

According to police, a fight broke out after a 19-year-old man and 15-year-old girl were denied entry to the house.

In an ensuing brawl, three people were stabbed. All of the stabbing victims were males aged 18, 19 and 25, respectively, according to Toronto police Const. Victor Kwong.

One of the victims remains in life-threatening condition in hospital.

Two other people were also hurt in the confrontation.

Police initially said after the incident that six people had been stabbed, but later revised their information Friday morning.

Kwong said the 19-year-old man and 15-year-old girl who were not allowed into the home have both been charged with the following:

1 count of attempted murder.

3 counts of aggravated assault.

3 counts of assault with a weapon.

1 count of weapons dangerous.

Both of the accused are scheduled to appear in court on Friday, police said.

Toronto police officers collect evidence at the scene of a triple stabbing on Madison Avenue. (Paul Smith/CBC)

Shootings in Brampton, Toronto

Little more than an hour later, a man was fatally shot in the yard at Ridgeview Public School in Brampton.

Investigators have identified the victim as Lorenzo Wright, 18, of Brampton.

The Peel District School Board said the school was closed for the day.

A male in his late teens or early 20s was fatally shot in the yard at Ridgeview Public School. Police at the scene seemed focused on the portables behind the school. (Jeremy Cohn/CBC)

Then at about 1:30 a.m., a male passenger in an Uber was shot in the area of Don Mills Road and Gateway Avenue in Toronto.

Kwong said the victim and the Uber driver had stopped when an SUV pulled up beside them. Someone inside the SUV then opened fire.

The victim suffered serious but non-life threatening injuries. Police were not able to provide his age.

This map shows the locations of shootings and stabbings in the GTA over the last 48 hours. (CBC)

Speaking to reporters at a traffic safety event Friday, Toronto Mayor John Tory called the overnight violence "incredibly disconcerting.

"I am disturbed by the fact that people seem to be prepared to engage in random acts of violence in the city, whether it's using a knife or gun or otherwise. We just have to put a stop to that," he said.

"The police, I think, are doing what they can."

Delivery driver nearly crushed by construction debris

Aside from the overnight violence, strong winds caused problems in neighbourhoods throughout the city.

In the area of Don Mills Road and Eglinton Avenue in Toronto, a delivery driver narrowly escaped serious injury when gusts toppled a large piece of a fence that blocked off a roadside construction site.

A wooden beam went through the front windshield of his van and pinned him inside. Emergency crews were eventually able to free the driver.

A delivery driver was lucky to escape with his life after his van was hit by a piece of construction debris that was toppled by strong winds. (Jeremy Cohn/CBC)

He was taken to the trauma centre at Sunnybrook Hospital but was reportedly conscious on the way.

Toronto Hydro said Friday morning it is dealing with multiple downed trees that caused power outages in pockets throughout the city. About 5,000 customers were affected at the peak of the outages.

A spokesperson said crews will be working throughout the morning to restore service.