The Wyoming Air National Guard Base in Cheyenne was still closed at last report  as military police continued their search of a vehicle that tested positive for explosives

Wyoming National Guard spokesman Tom Blackburn said the UPS truck tested positive for explosives this morning, and the entrance to the base has been closed for several hours as the search to determine whether the vehicle is actually carrying any explosives.

There have been at least 2-3 similar events at their Air Guard base in recent years. All of those situations turned out to be false alarms.

We'll report further details on this story as they become available.