A man who led U.S. Park Police on a chase down the George Washington Memorial Parkway on Friday night was shot by Park Police officers in the Alexandria area of Fairfax County and was in critical condition Saturday, Park Police said.

The man’s name and age were not released, and Park Police Sgt. James Dingeldein said he did not know why he was shot or whether he was armed. Park Police and Fairfax County police are investigating the shooting, Fairfax police Chief Edwin C. Roessler Jr. said.

The incident began about 7:30 p.m. with a car crash on the southbound parkway at the intersection with Slaters Lane in Alexandria, with the man’s sport-utility vehicle leaving the scene, Dingeldein said. Park Police officers spotted the vehicle minutes later heading south on the parkway and pursued it with help from Fairfax police, Dingeldein said.

The SUV left the parkway and crashed on Alexandria Avenue near the intersection with Fort Hunt Road, in the Tauxemont neighborhood of the Mount Vernon area, about 7:42 p.m., Dingeldein said. He did not know whether the shooting occurred before or after the crash. Fairfax officers were not involved in the shooting, Dingeldein said. No officers were injured in the episode.