A man wanted for a May 10 robbery remains at large after wielding a knife at a South Riding gas station. Shortly before 4 a.m., the suspect entered the Circle K on Defender Drive and asked the cashier for cigarettes. The man then brandished a large knife and removed an undisclosed amount of money from the cash register. The suspect is said to have fled the store on foot. He is described as a white male in his early 20's with a heavy build and has medium length reddish brown hair. He was last seen wearing a red shirt and gray shorts. If anyone has any information regarding this case, contact investigator Harper of the Loudoun County Sheriff's Office Criminal Investigations Division at 703-777-0475.