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Administrators confirmed with Eyewitness News that Heights High School was evacuated after allegedly receiving a bomb threat.
Principal Wendy Hampton sent a message to families assuring that students and staff are safe.
"The safety of our students is our absolute top priority," Hampton said in part of her message.
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Details weren't immediately available, but Hampton said HISD police and fire departments are investigating the incident.
Eyewitness News reached out to Houston ISD but has not heard back.