Montreal police are investigating after an unmarked police car collided with another vehicle near the intersection of Gaétan-Boucher and Davis boulevards this morning.

Police said a car making a left turn from Gaétan-Boucher Boulevard on to Davis Boulevard was hit by another car going straight through the intersection.

The collision happened around 8 a.m. in the borough of St-Hubert.

According to police, a 29-year-old officer with the Sûreté du Québec was at the wheel of the second car.

He was not injured.

longueuil crash

Two vehicles collided near the intersection of Gaétan-Boucher and Davis boulevards this morning. (Elias Abboud/CBC)

A 31-year-old man and his two passengers  a 14-year-old girl and a five-year-old boy  are being treated in hospital. 

The boy was rushed to the Montreal Children's Hospital. 

Longueuil police Const. Marc David said firefighters had to use the jaws of life to extract the five-year-old boy from the vehicle.

Jean-François Dion, who lives near the corner, said the intersection is a problem area, where people tend to go faster than the limit. 

He said he's not surprised there was a collision.