Police say a male motorcyclist is in hospital after colliding with a Durham Region Transit bus in Ajax last night.

The crash occurred near Harwood Avenue and Kings Crescent shortly after 9 p.m.

Police say the bus was heading southbound on Harwood Avenue and attempted to make a left turn on to Kings Crescent when the northbound motorcycle came speeding up Harwood Avenue and struck the bus.

According to investigators, the motorcyclist was thrown about 50 feet from the site of the crash.

He was rushed to a trauma centre, where he remains in serious condition.

Prior to the collision, police say officers in three separate cruisers were helping transport a patient suffering from mental health issues to a local hospital when they pulled up beside the motorcyclist at the intersection of Salem Road and Bayly Street.

Police say the motorcyclist nodded at the officers before swerving in between them and speeding off.

Officers were unable to pursue the speeding motorcyclist because they were committed to transporting the patient.

Police are asking that any member of the public who may have witnessed the crash to call Det.-Const.McDonald at 1-888-579-1520 ext. 5213.