A bomb squad responded after an inactive grenade was found in Vienna Wednesday morning.

An employee opening the Merchant Tire store for the day found the device in front of the store around 7:30 a.m.

The Fairfax County Bomb Squad responded to the scene in the 100 block of West Maple Avenue. The squad used a robot to pick up the device and examined it via the robot's video camera. After about 10 minutes, the grenade was determined to be inactive.

The robot then picked up the device and brought it to the back of the building, where team members dismantled it.

News4's Tony Tull tweeted that the pin was still in the grenade, but the blasting cap was out.

The FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives were on the scene, and are still trying to determine how the grenade ended up in front of the tire store.

West Maple Avenue/Route 123 was closed in both directions as authorities cleared the scene. It reopened shortly before 10 a.m.

Stay with News4 and NBCWashington.com as this story develops.