CALAVERAS COUNTY, Calif. — The Calaveras Unified School District is clarifying the timeline of Monday’s chaotic school bus incident, saying its review of bus video shows the situation began escalating within minutes of the bus arriving at its designated stop. “Based on our review of the bus video footage, the bus was stopped for approximately four minutes while the driver addressed concerning student behavior, reviewed bus expectations, and asked students to calm down,” the district said. “During that time, a student exited the bus through a window.” A 12-year-old student who was on the bus told KCRA 3 that students...