PORT ST. LUCIE, Fla. (CBS12) — Port St. Lucie police are asking for the public’s help identifying two vehicles that may have been involved in a hit-and-run crash that left a 63-year-old man with severe injuries.

Detectives now believe the man may have been struck by two separate vehicles, one traveling northbound and the other southbound, near Northwest University Boulevard and Northwest California Boulevard, police said.

The crash happened at about 12:56 a.m. Oct. 9. The man was found unconscious in the roadway with severe head injuries and was later identified as a Port St. Lucie resident.

Police previously said the man was taken to HCA Florida Lawnwood Hospital in critical condition.

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Investigators are working to identify both vehicles and their drivers. Police shared images of the vehicles and asked anyone who recognizes them, witnessed the crash or has dashcam or other video from the area to call the Port St. Lucie Police Department at 772-871-5000.