Greenville police are investigating two violent incidents. Police say 27 year old Steven Ballwanz, of New Jersey, was walking down Martin Luther King Junior Boulevard late Friday night, when he was hit in the back of the head and robbed. Police say the assailants got away with cash, and a number of credit cards. The second incident happened Friday night as well. Police say 19 year old David Jermaine Langley was driving down Martin Luther King Junior Boulevard when someone shot his car. Luckily the bullet did not hit Langley, but so far no arrests have been made in either of these cases.