Boston-091411– Boston Police and State Police responded to 300 Mass Ave next to the Christian Science Center for a report of a man wearing a ski mask carrying a gun in his backpack. Police with guns drawn formed a perimeter and blocked off cars and pedestrians on Mass. Ave. As the State Police cleared a man laying on a bench on Mass Ave, the Globe photographer pointed out the man to the trooper as matching the description. The suspect is handcuffed.

Photo by John Tlumaki