Dover Police are investigating a robbery in the parking lot of the Country Village Apartments Thursday evening around 5:30. Police say an 18 year old was waiting to meet an alleged seller from the “LetGo” mobile app to buy a cell phone. He was approached by four black men – two armed with knives. They demanded the victim’s wallet. One suspect struck the victim in the face and took the wallet which had cash and other items. Two suspects got into a dark colored car and left the scene. Anyone with information – contact Dover Police or Crime Stoppers.