Bomb squads were called after a truck trying to enter the Bedford, Massachusetts base tested positive for 'potentially explosive material during a routine stop around 9am Thursday morning.
Officials said the truck was transporting the belongings of someone who was moving onto the base.
Security Forces were doing a routine vehicle inspection when around 9:00 A.M. when they detected something that caused response actions.
'The Massachusetts State Police Bomb Squad has responded and our Air Wing is responding as well.
Some shipping materials from the vehicle were taken to the State Police crime lab for further study, Leahy said. He told reporters Thursday: "Given the times we live in, we operate in an abundance of caution". The vehicle in question is a moving truck owned by Big Foot Moving out of Acton. A WBZ report mentions that traces of explosive residue were seen on the truck.
Hanscom civilian air service was suspended, and state police asked the media to keep their helicopters out of the air space over the base.
Police closed an exit on a road leading to the base, which is about 20 miles (32 kilometers) from Boston.
Parts of the base have been evacuated, including the base's Vandenberg Gate and several facilities.
Hanscom Air Force Base is located predominantly within Bedford, Massachusetts, with portions extending into the adjoining towns of Concord and Lincoln.
No injuries have been reported at this time and the investigation is ongoing.
No one was injured in the incident and the base said the situation is under investigation.