Howard County Police announced arrest in Ellicott City armed robbery on July 20.
Approximately 5 p.m., police responded to a reported armed robbery in the 3300 block of North Chatham Road. At the scene, the officers located a teenaged victim who said he was robbed at gunpoint.
Preliminary investigation revealed the suspect approached the victim, brandished a handgun and demanded his belongings. No items were reported stolen, but the suspect assaulted the victim, before fleeing the scene.
The victim was transported to a local hospital for treatment of minor injuries.
Police arrested 20-year-old Dimario Martez Costley of Early Red Court in Columbia and charged him with assault, armed robbery and conspiracy to commit armed robbery.