CAMP SPRINGS, Md. -- The main gate at Joint Base Andrews in Maryland was on lock down Thursday evening after a security incident was reported at the Visitor Control Center, the base said on Twitter.

The incident has since been defused.

At approximately 5:15 p.m. today, there was a security incident reported at the Visitor Control Center. Emergency responders are on scene — Joint Base Andrews (@AndrewsAirForce) May 12, 2016

CBS News' David Martin reported that a woman showed up at the base visitor center claiming to be wearing a bomb vest.

Get Breaking News Delivered to Your Inbox

According to one AF law enforcement source, the individual did not have a bomb and is now in custody.

The incident took place around 5:15 p.m.

Emergency responders were on scene.