Calgary police are investigating a single-vehicle rollover in the city’s southeast end.
The crash happened at Peigan Trail and 52 Street S.E. just before 3 a.m. on Sunday.
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One person, believed to be the driver of the vehicle, was rushed to hospital in life-threatening condition, police said.
According to police, speed and alcohol are being considered factors in the crash.
Police traffic and collision reconstruction units were on the scene investigating.