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Officials say welding work ignited Back Bay fire that killed Boston firefighters Walsh and Kennedy

Boston Fire Department investigators were at the scene Friday where two firefighters died last week. Below, Boston Fire Commissioner John Hasson, flanked by Police Commission-er William Evans (left) and Assistant District Attorney Edmond Zabin, spoke to reporters.
Boston Fire Department investigators were at the scene Friday where two firefighters died last week. Below, Boston Fire Commissioner John Hasson, flanked by Police Commission-er William Evans (left) and Assistant District Attorney Edmond Zabin, spoke to reporters.Photos by Wendy Maeda/Globe Staff

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The welders were working in the rear of the building next door to the one where the fire broke out, apparently without a permit, according to fire officials.

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