An 18 year old victim was at a house party at 3400 Riviera Drive about 10:25 p.m. on Thursday, March 16. He left the party and went down the street to 1500 La Cima Drive where he was going to buy some marijuana. At some point the victim was shot once in the back and once in the arm. The victim went back to the house party and that was where the police were called. The victim was transported to the hospital with non life threatening injuries. The only description the victim gave was possibly a black male who left in a vehicle. San Diego Police Northern Division detectives are investigating.