The wreck happened at 5:30 p.m. just north of N. Glebe Road on the parkway, the Arlington County Fire Department tweeted. Firefighters cut a woman out of her car, but her condition is unclear.
Police haven't released details of the crash, but officers remained on the scene hours after as they investigated the incident. Traffic on the parkway was backed up for miles as officials diverted all northbound traffic to Spout Run Parkway until they are finished. One southbound lane was also closed near the crash site, officials said.
Traffic authorities told drivers to expect an "extended closure." Drivers should avoid this area.
Several people tweeted about the severity of the situation. Many drivers said they were stuck on the parkway for more than an hour not moving as police attempted to redirect vehicles away from the crash site.
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