A 15-year-old boy is in critical condition after being hit by a school bus in St. Paul this morning. Sgt. Mike Ernster says the bus driver, a 50-year-old man, is cooperating with investigators and has shown no initial signs of impairment. Ernster says the teen was in a crosswalk at Dale Street when he was struck by the turning bus. It happened at around 7:15 a.m. The names of the boy and the bus driver have not yet been released.