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Police said emergency services were called to an area of Fitzgerald Avenue near Hereford Street, about 2:15pm on Saturday.
Two people were taken to Christchurch Hospital, while three others in a minor condition were treated at the site.
A woman who was among the first to the scene said she helped a woman and a child who were seriously injured after a car collided with them at an intersection.
The woman said she helped some men lift the car off a boy trapped underneath
She said her daughter also helped a woman who was the boy's aunty.
Police had earlier asked motorists to avoid the area.
