Four people were taken to hospital after a head-on collision between two vehicles in Longueuil early Friday morning.

The crash happened on Taschereau Boulevard, near Greenfield Park, around 4 a.m., police say.

One woman sustained injuries considered to be life threatening.

Police have arrested a woman in her 20s for impaired driving.

Taschereau Boulevard was closed between Charles and Georges Streets Friday morning while police investigated. It has since reopened.