Colorado police are in attendance at Columbine High School after receiving a threat.
A lockdown is in place at the school as well as a number of others in the area.
Police say they received a phone call from a man claiming to be hiding outside the school with a gun.
The area has been searched but police have not found anything.
Police say they received number of threats to Columbine High School.
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The Jefferson County Sheriff says students will be released to their parents at 10.45am New Zealand time.
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