The entrance to Davis-Monthan Air Force Base in Tucson, Ariz., on , Sept. 16, 2011, after a report of a man with a gun prompted panic and reports that someone had been shot at the sprawling military facility. Traffic into and out of the base was limited because of the security situation, but no one was shot or hurt, according to the public affairs office at the base.
The entrance to Davis-Monthan Air Force Base in Tucson, Ariz., on , Sept. 16, 2011, after a report of a man with a gun prompted panic and reports that someone had been shot at the sprawling military facility. Traffic into and out of the base was limited because of the security situation, but no one was shot or hurt, according to the public affairs office at the base. GARY M. WILLIAMS ASSOCIATED PRESS
The entrance to Davis-Monthan Air Force Base in Tucson, Ariz., on , Sept. 16, 2011, after a report of a man with a gun prompted panic and reports that someone had been shot at the sprawling military facility. Traffic into and out of the base was limited because of the security situation, but no one was shot or hurt, according to the public affairs office at the base. GARY M. WILLIAMS ASSOCIATED PRESS

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