A fire broke out in a building under construction at the Health Sciences Centre Tuesday night, prompting officials to move more than 90 patients at Children's Hospital from the facility.

No injuries were reported and damage is estimated at $1 million. Officials are investigating the cause of the fire but said it appears suspicious in nature.

Fire crews rushed to the hospital on William Avenue and Sherbrook Street in Winnipeg around 11:30 p.m. Tuesday night, said officials. 

Smoke was billowing from the roof of the Diagnostic Building, currently under construction. Smoke from the fire also entered Children's Hospital, said police.

HSC staff relocated 92 Children’s Hospital patients and 10 other patients in Children's ER to other parts of the complex, said officials.

“With the imminent threat of potential danger and the reality that there was a lot of smoke starting to fill the building, it became very clear to our staff onsite that patients and staff were in potential danger so they triggered the contingency planning right away,” said Dana Erickson, chief operating officer at Health Sciences Centre.

Chris Bakosti, a father, had just gone down to get a drink from a vending machine when the fire alarm started sounding.

“The fear I had was where's my son? Where's my wife? I need to see them and it got to the point where people who were in our room with us were down there and then I started panicking,” he said.

Bakosti eventually found his son and wife and said he’s happy to report that everyone was OK. He said staff at the hospital handled the situation well and made parents and children feel safe and secure.

Fire officials declared the blaze under control around four a.m. Wednesday morning.

By 12 p.m. Wednesday, all the Children Hospital's patients had been allowed to return to rooms, said officials.

One firefighter suffered a minor injury fighting the blaze, officials said.

Some childrens' non-urgent surgeries were rescheduled.

Fire and police officials said the blaze's cause and damage amounts are not yet known.

Sources told CTV News a 16-year-old boy was being questioned by police. The boy's mother spoke to CTV News. She said her son was taken to the ER, after she believed he had overdosed.

The woman said when she got to the ER, her son wasn't there.

“They told me, 'He told us he does this all the time.'  I said, ‘How could you let him go like that?’ I brought him in to be assessed and they just made it seem like he'd be OK,” said the woman.

She later learned her son was picked up by security at the adult ER, where he had been waiting for friends to pick him up.

“One police officer called me over and says, 'We have to talk to you about something. There was a fire started at Children’s (Hospital) and we think he did it.  And he's not going to see a doctor this evening. He's going to come with us,'” said the woman.

The woman said she was told security found a lighter on her son. She said her son didn't get the medical treatment she wanted and was handcuffed and restrained for hours. She said she's considering filing a complaint against police and hospital staff.

Police did not confirm Wednesday whether the teen is a suspect.

Officers said the investigation will take some time to complete to determine the cause of the fire.

“At this point, there's no initial indication that it is accidental in nature...obviously a fire of this magniture will take some time to investigate,” said Const. Eric Hofley from Winnipeg police.