Cleveland ISD said at about 10:24 a.m. that classes had resumed as scheduled.
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The school first posted about the lockdown at about 8:30 a.m.
According to Cleveland ISD, a student was arrested and removed from class after district officials received an anonymous tip indicating that the student brought a weapon to school. The campus was immediately placed on lockdown.
A nonfunctioning "look-alike" weapon was found and confiscated within 20 minutes of receiving the tip, the district said.
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The student was arrested.
"Cleveland ISD takes all threats seriously. Cleveland ISD applauds the student who alerted staff to the fact that someone had potentially brought a weapon to school and the school administration for their quick actions. Although the confiscated weapon was a "look-alike," the district is treating the situation with the same level of intensity as if it were real," a statement read.
The district said any students found to be involved with the incident will face disciplinary action.