According to the school district, the student is in custody. The campus was also placed on lockdown as a precaution. It has since been lifted, as of 9:30 a.m.
"All students are safe," Clear Creek ISD posted on its website.
CCISD later gave details about the situation.
"Police arrested a student just before 9 a.m. who had an unloaded weapon on campus. The school was placed in a lockdown as a precaution so that officers could do a search for ammunition. No ammunition was found," the district wrote in a statement.
Clear Brook's school day is continuing as normal, CCISD added.
Countless school districts across Texas issued statements in the wake of the Uvalde elementary school shooting, with many vowing to add additional patrols on campus.
COMPLETE COVERAGE: Uvalde, Texas school shooting
Twenty-one lives were lost at Robb Elementary School, including 19 children in the fourth grade and two adults.