School administrators in Hilliard say they're adding more security after a bus driver was stabbed and sexually assaulted on Friday.
A letter from the district's superintendent says bus compounds will have more security until police say the threat has subsided.
The letter follows a Friday morning attack on Nike Drive. Police say the suspect, who remains at large, apparently broke into the bus and attacked the woman driver when she arrived for her morning route.
Police say she was able to fight off the attacker and run to a nearby business, where employees called police.