MacDill Air Force Base, Florida (CNN) -- A heavily armed man and woman were in custody Monday after trying to enter the Air Force base that houses the headquarters for U.S. troops in Iraq and Afghanistan without authorization, an Air Force spokeswoman said.

The pair were stopped at a gate at MacDill Air Force Base about 5 p.m. after they could not show proper identification, Senior Airman Katherine Holt said. A search of the vehicle after they were detained found military-style uniforms and gear and several "rifle-type" weapons, Holt said.

The two were being questioned Monday evening, another Air Force spokeswoman, Elizabeth Gosselin, told CNN.

Authorities cordoned off their sport-utility vehicle and searched it using a robot, but no explosives were found, Holt said. Video showed base personnel removing weapons, ammunition and military-style clothing from the vehicle.

The Tampa, Florida, installation houses the headquarters of U.S.Central Command, which runs the U.S. wars in Afghanistan and Iraq, as well as the U.S. Special Operations Command. One gate into the facility was closed, but another remained open, the base command reported.

CNN's Adam Levine and Rich Phillips contributed to this report.