Published: May 06, 2010 6:31 PM EDT

PORTSMOUTH, N.H.  - Passengers are getting off a Greyhound bus involved in bomb scare in Portsmouth, N.H., with their hands in the air.

Police had surrounded the vehicle and evacuated nearby buildings and streets after a report of a suspicious device on board.

Police Capt. Mike Schwartz said someone on the bus called 911 and reported an explosive device after arrival in Portsmouth. He says police are in contact with people on the bus, but it was unclear why they initially remained on board.

The driver, who police say was among the first to get off the bus, is being questioned. The state police explosives disposal unit and the FBI are on scene. Police have closed streets and evacuated businesses, including a Hilton hotel in the busy downtown area.

The bus had left Bangor, Maine, and was en route to Boston, then New York.