State Police say two pre-school aged children died after a school bus flipped Monday afternoon in Northern Kentucky.
Investigators say nine children were on their way home from a pre-school Head Start program when the bus overturned and hit a tree.
Troopers say four children were taken to hospitals and three were released to their parents.
They say the bus driver wasn't hurt.
An adult aide also on the bus was taken to the hospital, according to troopers.
