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San Antonio police are investigating a shooting that killed two people and wounded four others at Market Square early Sunday morning. After hearing gunshots near a stage at a Fiesta event, officers chased an 18-year-old man who shot a 20-year-old man during the pursuit. Officers shot the suspect, who died at the scene. The victim was pronounced dead at a local hospital. Four women in the crowd were wounded, but it's not yet known if the shots were fired by the suspect or the police.