Published: May 07, 2010 4:00 PM EDT

PORTSMOUTH, N.H.  - Two people have been arrested in connection with a daylong bomb scare on a Greyhound bus in Portsmouth, N.H.

Police say a Lewiston, Maine, man was charged with refusing to get off the Maine-to-New York bus, and a New York City man was charged with obstructing officers. Both are to be arraigned in Portsmouth later Friday.

A person close to the investigation tells The Associated Press the passenger at the center of Thursday's scare was a foreign national who was too frightened to get off the bus.

The person, who spoke on condition of anonymity because he was not authorized to speak publicly, said the scare was sparked by another passenger who called 911 believing a non-English-speaking rider had mentioned a bomb.

U.S. Attorney John Kacavas confirmed the passenger was from Africa.

The 911 call Thursday morning prompted authorities to evacuate buildings and streets and surround the Maine-to-New York bus. The other 16 passengers and the driver got off safely. No explosives were found.