UPDATE, 3:55 P.M.:
Southbound lanes of the Fairfax County Parkway have reopened, authorities said.
Southbound Fairfax County Parkway was closed Monday after a crash, police said.
At around 1:30 p.m., Fairfax County Police tweeted that the southbound side of the parkway was closed at Braddock Road after a collision, and one person was taken to a hospital with life-threatening injuries.
Police asked that commuters avoid the area.
It was unclear how long the lanes would be closed.