Updated at 4:05 p.m. Police are investigating an unusual accident near Westover involving a bicyclist.

Initial reports said the cyclist was unconscious when police arrived, after being struck by a vehicle that left the scene. However, a police spokesman now says there might not have been a vehicle involved at all.

Police believe the cyclist may have suffered some sort of medical emergency and then fell onto the road, unconscious. However, the investigation is still ongoing and details are still coming in.

A tipster said the cyclist was transported to Fairfax Inova Hospital.

Earlier, Patrick Henry Drive was closed between 9th Road North and 11th Street North, and 10th Street North was blocked off where the accident occurred. All roads have been reopened.

There’s no word so far on the cyclist’s condition or the nature of the possible medical emergency.