Two Boston firefighters lost their lives because a company failed to follow safety precautions, according to fire officials and OSHA.

An investigation into the March 26, 2014 fire at D & J Ironworks found that owners Guiseppe Falcone and Daniele Falcone failed to follow safety precautions by allowing employees to install railings using arc welding equipment during high wind conditions. Fire officials said sparks from welding railings ignited clapboards on an adjacent shed, which led to the fire.