A homicide investigation is underway after three men were found deceased inside a Mississauga condominium building on Wednesday afternoon.

Const. Heather Cannon said police were called to a unit in the building near Burnhamthorpe Road and Hurontario Street at around 1:30 p.m.

She said three men in their late 20s were then found deceased inside.

The deaths are being treated as suspicious at this time.

“The coroner attended, and they deemed it to be suspicious and actually had our Homicide and Missing Persons Bureau attend,” Cannon said. “At this particular point, they have been in their early stages of that particular investigation.”

A fourth male victim was found inside the condo and was transported to a local hospital as a precautionary measure. However, Cannon said the victim's condition has worsened and is now listed as serious.

All four are known to each other, she said. However, it is unclear if they reside in the unit.

Cannon noted that police also found illicit substances laced with another substance at the scene.

“We believe that they make up part of what has occurred today and it’s quite tragic,” she said.

Cannon said investigators believe there may have been a get together at the residence Tuesday night and several people may have ingested those substances.

“If those people are not feeling well, we do ask that they are attending a medical facility,” she said.

There is no suspect information at this time.

Dr. Kavita Aswani, who recently moved into the building, said she heard a noise around midnight and checked on her son, whose room shares a wall with the apartment where the men were found.

“I didn’t hear a whole lot,” Aswani said. “He heard loud noises. That’s all he said.”

When she went to put the garbage out this afternoon, Aswani said she saw police next door and asked them what’s going on.

Officers told her that there is an investigation happening, but they can’t share any further details.

“I’m freaked out,” Aswani said. “We didn’t hear any gunshot or anything. I don’t know.”

Anyone with information is being asked to contact police or Crime Stoppers anonymously.