The actions — or more notably, the inaction — of a school district police chief and other law enforcement officers have become the center of the investigation into this week’s shocking school shooting in Uvalde, Texas. The delay in confronting the shooter — who was inside the school for more than an hour — could lead to discipline, lawsuits and even criminal charges against police. The attack that left 19 children and two teachers dead in a fourth grade classroom was the nation’s deadliest school shooting in nearly a decade, and for three days police offered a confusing and sometimes contradictory timeline that drew public anger and frustration. By Friday, authorities acknowledged that students and teachers repeatedly begged 911 operators for help while the police chief told more than a dozen officers to wait in a hallway at Robb Elementary School.