Police said that at about 3:20 p.m. they were called to the school at 701 Schick Road. Police said the students, a boy and a girl, were running alongside a school bus that was pulling into the bus lane when they fell and were struck.
Fire officials said the boy had his arm run over and was taken to S.t Alexius Hospital where he is in good condition. The girl is in critical condition after being run over in the pelvic area, fire officials said. She was initially taken to Central DuPage Hospital and then was airlifted to Loyola Medical Center in Maywood.
Officials said the girl's injuries are life threatening.
Bartlett police are working with School District U-46 to investigate the incident and determine exactly what went on.
In a statement, the school district said in part, "Emergency personnel responded quickly, and both students received immediate attention... The safety and well-being of our students are a top priority. We are working closely with local authorities and school staff to review the situation."
The students' ages and grade levels were not released. The investigation is ongoing.