Las Vegas police tell Fox News they are responding to a call about a distraught individual near Nellis Air Force Base.
Authorities say they believe the male suspect is armed with a handgun and is barricaded in a parking lot near the front gates of the base.
A local report says the man is in a car in the parking lot of Mike O’Callaghan Federal Medical Center located on the base.
Negotiation and SWAT units are en route to the scene, News3.com reported.
The base is located about 8 miles from downtown Las Vegas.