Cedar Hill Elementary and Ardmore High schools were temporarily placed on modified lockdown Thursday morning.
An incident at a home near the elementary school prompted the move, according to an email sent to parents and guardians of students at both schools.
The email said the Ardmore Police Department secured the scene at the home and the schools went back to normal operations.
Ardmore Police Chief James Kennedy said a crossing guard at Cedar Hill Elementary School heard a gunshot and called police.
He said they found a man had been shot in the arm, possibly by birdshot from a shotgun. He said the injury was not serious.
The Limestone County Sheriff’s Office is investigating.