A multi-vehicle crash between the McKnight Boulevard and 64th Avenue exits on northbound Deerfoot Trail in Calgary caused traffic delays during Wednesday's rush hour.

Emergency crews responded to the crash at 3 p.m. MT.

The Calgary Fire Department said six vehicles and a semi-trailer carrying gasoline were involved, but an EMS spokesperson was told there were only four vehicles in total.

During most of rush-hour only one northbound lane was open and traffic was backed up to Memorial Drive.

Around 6 p.m. the lane was reopened.

Firefighters had to help remove a person from one of the vehicles, and three people were taken to hospital by EMS in stable condition with minor injuries.

The cause of the crash is still under investigation.