Nine people were wounded in a mass shooting in downtown Tucson, Arizona, early Sunday before a responding police officer shot the suspected gunman, bringing the attack to an end, authorities said. The violence unfolded around 2 a.m. near the intersection of East Congress Street and Sixth Avenue, a popular nightlife district, where officers already patrolling the area on foot heard gunfire and immediately ran toward the scene. According to Tucson police, officers encountered a man fleeing the area and repeatedly ordered him to stop. When he failed to comply, one officer fired a department-issued weapon, striking the suspect. Officers provided...