Two of the boys had guns, and a third boy had some kind of device. Police aren't sure what it is, but some thought it might be a smoke device.
The boys were arrested before anything could happen, and it is not yet known what they intended to do with the guns. Nothing has been said yet about whether or not any ammo was found.
The school conducts lockdown practices at least once a semester. Things remained calm, and classes reopened once the lockdown was over.
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Source: http://news.yahoo.com/3-youths-arrested-guns-smoke-device-denver-school-163632639.html
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Graphics: Mine
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Keywords: Denver, boys, guns, lockdown, middle school, arrested