Killeen ISD officials say students and staff are safe and classes are back in session after smoke was spotted at Trimmier Elementary Monday morning.

According to a social media update from Killeen ISD, the smoke was found to be coming from an air conditioning unit. Classes resumed after Killeen firefighters inspected the building and gave the all clear.

Meanwhile, police and sheriff's deputies were on the campus of Academy High School in Little River-Academy Monday morning after an alleged threat was made.