Police are investigating an alleged hit-and-run that seriously injured a motorcyclist on Friday.The Toronto Police Service says the collision happened in North York, near Keele Street and Lawrence Avenue West just before 10:30 p.m. A man in his 40s who was riding a motorcycle was taken to a hospital with serious, but non-life-threatening injuries. Police say the driver of the other vehicle did not remain at the scene.An investigation is ongoing.