Military authorities are checking a vehicle after a bomb-sniffing dog sensed something inside it at a Nellis Air Force Base gate.
A police spokesman says part of Las Vegas Boulevard is blocked off not far from the Mike O'Callaghan Federal Hospital while officials investigate.
He calls it a precaution.
No word yet if the car actually contains any explosives.
The driver is being questioned after the alert at the hospital gate.
That's across the street from the air force base.
A base spokeswoman says the alert was posted about 11:15 this