An off-duty Peel Regional Police officer was among two people who died in a single-vehicle crash early Saturday in Mississauga.

Peel Regional Police said in a news release that the officer involved in the crash in the area of Lakeshore Road W. and Avonhead Road was driving the vehicle.

The off-duty officer and a passenger were pronounced dead at the scene.

A third person in the vehicle, also a passenger, suffered serious but non-life-threatening injuries and was taken to hospital. There were three occupants of the vehicle. Police received a call about the crash shortly before 3 a.m. 

Jennifer Evans, chief of Peel Regional Police Service, expressed condolences in the news release.

"It is with heavy hearts and deep sadness that we learn of the death of one of our fellow officers. Our thoughts and prayers are with his family, and both other families impacted by this tragic event," Evans said.

"The flags will now fly at half-mast out of respect for our fallen friend." 

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Paramedics from Peel region and Halton region went to the scene of the crash early Saturday. (Tony Smyth'/CBC)

Peel police said the double fatal crash is having a "far-reaching and deeply felt impact" on the force and it has asked the Toronto Police Service to take the lead on the investigation.

Police have not released the ages of the victims nor the sexes of the two passengers. 

Supt. Steve Walker, spokesperson for Peel Regional Paramedic Services, said paramedics took one person to a local hospital in serious condition. 

According to a reporter who arrived at the scene shortly after the crash occurred, it appeared that the vehicle had been travelling southbound on Avonhead Road when it went through the intersection at Lakeshore Road W., where Avonhead Road ends.

The car appeared to have rolled and it ended up on its side near some trees. 

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Peel Regional Police said at the scene that two people were pronounced dead shortly after the crash. (Tony Smyth/CBC)

All area roads that were closed to allow officers to reconstruct the accident have been reopened.

Avonhead Road, which was closed from Royal Windsor Drive to Lakeshore Road W., is now open.

And Lakeshore Road W., which was closed in both directions, from east of Winston Churchill Boulevard to Southdown Road, and Southdown Road, which was closed south of Royal Windsor Drive, are open. 

Anyone with information is asked to contact investigators with Toronto Police's traffic services at (416) 808-1900. 

Information may also be left anonymously by calling Peel Crime Stoppers at 1-800-222-TIPS (8477), or by visiting www.peelcrimestoppers.ca or by sending a text message to CRIMES (274637) with the word "PEEL" and then the tip.