This story was updated at 2:30 p.m. on Friday, Nov. 1, 2019, with more information.
First responders were called to a Hamilton County school bus Friday morning after passengers had an "adverse reaction" to something that was sprayed inside the bus, according to district spokesperson Tim Hensley.
Chattanooga police arrived and found a small canister of what appeared to be pepper spray, according to police.
All students were checked out by emergency personnel. None were injured or received exposure to the substance that was sprayed, police said.
The driver declined medical assistance.
A Hamilton County Sheriff's Office school resource officer arrived shortly thereafter and said he would review video footage to complete a separate report of the incident, according to a Chattanooga Police Department sergeant who was at the scene.
It's not clear if any criminal charges could be filed, as sheriff's office spokesman Matt Lea repeatedly denied the county's involvement.
"This is not our call," Lea said. "You will need to speak to CPD."
Chattanooga police only responded to file a miscellaneous report.
The bus, which was transporting students to Brainerd High School, had pulled over on Shallowford Road at around 8 a.m.
It is unclear how many students were on the bus.
School district officials also responded to the incident.