Four defendants are members of the "Sureño Villains 13" street gang. Just before midnight Saturday they had argued with several members of the rival "Norte" gang at a South Park gas station. Apparently, the Sureños were angry that the Nortes had been marking out the Sureños' graffiti "tags."When the Sureños warned them to leave their tags alone, the Nortes just laughed, the documents say. The Sureños talked about shooting the Nortes right then and there but decided against it because a gas-station surveillance camera might record them.Meanwhile, the Nortes ran away, down an alley. But about 20 minutes later, the Sureños found their foes behind a house in the 1000 block of South Sullivan Street, the documents say.Gomez-Pablo parked the SUV, and Rapisura, Gomez-Cervantes and Santos got out and ran toward the Nortes. Several shots rang out, and Joshua S. Vanhalteren was hit once in the back, the documents say.Vanhalteren ended up at Harborview Medical Cen...