Decatur police officers are on the scene this morning at the city’s middle and high schools following what officials say was a threat.

As of 10:15 a.m., police said the schools have transitioned from heightened alert to “secure perimeter.” ‬Officers are continuing an investigation.

Earlier, the schools were on heightened alert after a teacher received a suspicious email, police said in an announcement.

WHNT, citing a Decatur City Schools spokesperson, reported a possible former student sent an email to a teacher making a potential threat.

The station quotes Elizabeth Gentle, director of communications, as saying the school system received three messages this morning, possibly sent by a former student threatening gun violence.