Authorities say the bus that accidentally struck and killed a grandmother in Hamblen County Friday had no mechanical issues wrong with it.
The accident killed 63-year old Sandra Acres.
She was driving with her two grandkids near Meadowview Middle School when another driver hit her from behind.
She got out to talk with the driver and a school bus passing by hit her.
Authorities say the driver might have been blinded by the sun at the time of the accident.
They have not issued any citations at this time.