The exterior doors of Hamilton Middle School in southeast Denver were closed on Wednesday afternoon due to a police investigation of a "possible suspicious device," at or near the school, according to Denver police.
"We’re responding to threats at the school. We’re investigating," said police spokeswoman Christine Downs."We’re trying to figure it out."
However, no device was found, the police department tweeted just before 3 p.m.
Denver Public Schools called the situation a "lockout," which in the schools' definition means there's not an immediate threat to the school. Students and staff are safe, according to DPS.