District officials say some of their schools were among those threatened in a clown-related social media hoax that affected campuses across the state.
VIDEO: Clown threats: Local schools bring in extra security in wake of threats
Spring ISD police concluded the social media threat was not credible, but will step up their security presence at a number of schools in the district as a precaution.
The district says it is continuing to monitor the situation.
See also: Clowns in America: Timeline of scares, sightings