The incident was reported around 11:30 a.m. in Benjamin Banneker Park, near East Falls Church, according to Arlington County Police.
Police say “an unknown male subject was seen standing naked in the bushes” along the W&OD trail. A man walking his dog saw the man and called police.
The suspect is described as “a Hispanic or Middle-Eastern male, with dark hair and a slim-build.” There were no additional reports of the man being seen by other trail users.
“It appears to be an isolated incident at this point,” said Arlington County Police Department spokesman Dustin Sternbeck.
The temperature in Arlington around 11:30 Saturday morning was a chilly 55 degrees.
Police do not believe this incident is connected to any other previously-reported crime along the trail. Earlier this year a man tried to sexually assault a woman on the trail in Glencarlyn Park, and a few years ago a string of indecent exposure incidents along the trail prompted police to issue warnings to trail users.