Hanscom Air Force Base in Massachusetts was partially evacuated for several hours on Thursday over concerns of a possible bomb.

A Massachusetts State Police bomb squad was 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.

The military scanned the vehicle first and got a positive reading for hazardous materials. When the bomb squad arrived on the scene, they got the same reading.

Around noon, bomb squad members wearing vests and helmets went through the vehicle with the help of two bomb-sniffing dogs. They started bringing out carboard boxes, a mattress and other items form the vehicle. An hour later, officials gave the all clear, saying the truck was safe and that operation could resume as normal at the base.

At an afternoon press conference, officials said they found two containers or pallets on the truck that contained 'potentially concerning residue'. Those containers are now being taken to a lab for further analysis.

However, officials said that no one is in custody or suspected of a crime, and they don't expect any arrests in the future either. Their main focus now will be figuring out how the trace amounts of concerning materials ended up inside the truck.

Hanscom Air Force Base in Massachusetts was partially evacuated for several hours on Thursday over concerns of a possible bomb

Bomb squads were called shortly after 9am, when a moving truck tested positive for 'potentially explosive material'

Around noon, bomb squad workers started taking boxes off of the truck while bomb-sniffing dogs inspected the items

More emergency vehicles arrived at the scene of the stopped truck around 1pm. At 1:30pm, officials announced an all-clear for business to return to normal

The officials would not say what materials they found inside the truck. That's something that will be determined when the chemist looks at the pallets.

After the press conference, the truck that was stopped was seen finally driving onto the base to complete its shipment.

The driver and passenger were questioned by police earlier in the day, and the CEO of the moving company had been cooperating with authorities.

A spokesman for the moving company told WBZ that the truck was only supposed to be carrying household goods, and was scheduled to make the delivery at the base.

State Police said that the moving truck was hired by a military family who were moving into housing on the base.

A press conference is planned for later this afternoon, when more will be revealed about the incident

The moving company spokesman said that the truck was only supposed to be carrying household goods, and was scheduled to make the delivery at the base.

Shortly before 11am, the Massachusetts State Police released this statement: 'At approximately 0945 hours today we were notified of a suspicious truck that had been stopped by base security at Gate 1 at Hanscom Air Force Base. A standard screening of the truck and its cargo revealed indicators of potentially hazardous material. The Massachusetts State Police Bomb Squad has responded and our Air Wing is responding as well. As a safety precaution, an area around the gate has been evacuated.'

Hansom Air Force Base officials said what was found 'potentially explosive material,' in a press release of their own.

During the bomb scare, parts of the base were evacuated, including the base's Vandenberg Gate and several facilities near it.

Mass State Police set up a perimeter around the truck extending 1,500 feet after the reports. They also temporarily closed the nearby exit from Route 2A and asked news helicopters to refrain from flying overhead.

The Hanscom Air Force Base is 848 acres large and headquarters the 66th Air Base Group. More than 10,000 people work at the base, which has more than 150 buildings.