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CAPTION ONLY: HUNDREDS FLEE BOSTON FIRE FLAMES

SHARE CAPTION ONLY: HUNDREDS FLEE BOSTON FIRE FLAMES

Flames shoot from the roof of the 24-story John F. Kennedy Federal Building in Boston Friday after more than a dozen explosions were heard on upper floors where renovation work was under way. About 1,000 employees fled down stairwells during the blaze, which sent debris crashing onto the street.