Police in the Wise County town of Paradise arrested a man with a gun on Wednesday hiding behind a wall at the high school.
A witness called 911 about 4 p.m. to report a man carrying a rifle and walking across the Paradise Independent School District campus, Wise County Sheriff Lane Akin said in a news release.
State troopers arrived within five minutes but the man had disappeared.
Band members, student athletes and others were on campus. The school was placed on lockdown and later evacuated.
Officers noticed a ceiling tile at the high school appeared to have been disturbed and began searching the ceiling crawl space.
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Source: NBC DFW