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Toronto’s Pearson International Airport says operations are back to normal after a fire broke out near a security checkpoint Sunday night forcing the cancellation of all U.S. flights departing from Terminal 1.

A Greater Toronto Airports Authority spokesperson told Global News both Terminal 1 and 3 were operating normally, though U.S. departures at Terminal 1 where the fire started were expected to see continued delays.

Travellers were advised to check their flight status today before heading to the airport, which is Canada’s busiest.

READ MORE: Air Canada and WestJet shift planes to address shortages from MAX 8 grounding

No one was seriously hurt in the incident, but several people were treated for what police described as “smoke-related injuries.”

Paramedics said one woman was taken to hospital in stable condition.

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Const. Akhil Mooken of Peel Regional Police said the cause of the fire is under investigation, but it is not believed to be suspicious.

Officers were called to the scene at around 6:30 p.m. Just before 7:30 p.m., police said on Twitter that the blaze had been extinguished, though there were significant amounts of water and smoke in the building.

Crews are working to repair the damage, police said.

Toronto #pearson #yyz has closed international departures for some sort of fire inside the airport.. It's always something in this place. pic.twitter.com/eE9a5kg0rC — jamesagnew (@jamesagnew) March 17, 2019

Dozens of inbound flights were held on the tarmac for hours for safety reasons.

Passenger Heather Bailey, who was arriving from Barbados, tweeted that there were 22 planes ahead of hers.

Another passenger, Duncan Smit, told The Canadian Press that his flight back home to Amsterdam had been delayed several hours.

“There was a lot of smoke in part of the terminal,” he said from his gate at Pearson, where he had been waiting since the morning.

Processing for inbound arrivals and international outbound passengers at Terminal 1 resumed around 10:20 p.m.

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“We thank passengers for their patience as we put safety first,” the airport said in a tweet.

Outbound international & inbound arrivals processing at Terminal 1 has resumed. We thank passengers for their patience as we put safety first. Outbound US flights from T1 are cancelled tonight. Please check your flight status with your airline before leaving for the airport. https://t.co/WeSSuTe8Dn — Toronto Pearson (@TorontoPearson) March 18, 2019

In addition to the flight cancellations on Sunday, passengers scheduled to fly to the U.S. out of Terminal 1 on Monday are being asked to check with their airlines before leaving home.

There is no word yet on what started the fire.

With files from Eric Stober, Global News and the Canadian Press

Update: Fire has been extinguished however a significant amount of water and smoke exist. We are encouraging all passengers to check their flight status before attending the terminal. I will provide a media staging point shortly. — Peel Regional Police (@PeelPoliceMedia) March 17, 2019

@CBCNews – #PearsonAirport is the scene of an apocalypse movie right now pic.twitter.com/TCjJJYMgLm — Diane Doran (@doran_diane) March 17, 2019

where there is smoke, there is apparently fire (duty free). gate F. pearson international airport, toronto, on. #USCAP2019 pic.twitter.com/705pL6zjDW — Brendan Dickson, MD (@histiocytosisX) March 17, 2019