The robbery happened around 4:20 p.m. Friday, on the trail near the East Falls Church Metro station.
Police say the woman yelled for help, scaring off the suspects. The pair — a juvenile male and female — were later arrested on a bus and charged with armed robbery and gun charges.
From an ACPD crime report:
ARMED ROBBERY, 160909040, 6600 block of N. 19th Road. At approximately 4:22 p.m. on September 9, officers responded to the report of a robbery. When on scene, it was determined that a female victim was walking on the W&OD trail and was approached by two masked subjects who demanded her property at gunpoint. The victim began to yell for help, causing the subjects to flee. A witness observed the subjects get on to a bus where they were later apprehended by officers. The male juvenile subject was charged with armed robbery, conspiracy, and use of a firearm while committing a felony. The female juvenile subject was charged with armed robbery and conspiracy. Both were transported to the juvenile detention facility.