Car backfires; 2 Texas schools put on lockdown 18 Dec 2012 The Birdville Elementary School in Haltom City and nearby Shannon Learning Center were both on lockdown for about an hour Tuesday morning. Police said they initially received a report of a gun or gunfire near the school. A student had allegedly reported seeing a teenager fire a gun in the air. School administrators quickly confirmed that no shots were fired in the school and no one was injured. It was as police continued their investigation, after the lockdown was cancelled, that a parent came forward and told police he may have caused the loud bang that was thought to be gunfire.