Owensboro Police are investigating a robbery that took place Tuesday night. At 9:30pm Scott Crabtree told officers he was walking near the intersection of West 9th and Frederica Street when two black males approached him. One was armed with a knife and allegedly took his wallet. The two fled and a vehicle and Crabtree was not injured. Anyone with information that can assist police in this case is asked to call Owensboro Police or Owensboro Crime Stoppers.