Update at 4:26 p.m. ET: AP cites an unnamed military official as saying a special agent on the base reported that an armed individual had walked into a building. So far no one has been detained.
A tech sergeant tells KOLD-TV that a man was seen carrying “something gun-like” near an old base dorm that is now used for civil engineering training. It’s unknown whether he was a civilian or military.
Source: Michael Winter for USA TODAY.