Saskatoon police are on scene of a collision involving around four vehicles on Circle Drive.

Police say they initially thought six were involved, but determined only four were after responding.

The crash happened shortly after 8 a.m. CST on Circle Drive near Avenue C N. The traffic restrictions were lifted at about 9 a.m.

Police say they are investigating the possibility that impairment was a factor.

It's unclear at this point if anyone was injured. Police say one person was transported to hospital as a precaution.