Attleboro, MA - Fire alarm received the master box for General Metals Finishing at 42 Frank Mossberg Drive around 2200hrs on April 26, 2009. The building housed a metal finishing company that specializes in gold electroplating and had considerable chemicals stored inside. The first due arriving companies on this box reported heavy smoke showing from the rear of this 60x200 1 story concrete block commercial structure. Firefighters found heavy fire in a rear room that had extended through the roof. Within minutes of the initial response, firefighters reported that a section of the roof had collapsed in the rear of the main building. Attleboro Ladders 1 & 2 prepared their waterways to flow water down on the raging blaze. The OIC requested a second alarm bringing in the rest of the on duty personnel along with mutual aid from North Attleboro and Pawtucket, RI. Pawtucket Engine 4 laid in a supply line and fed the fire department connection to charge the building's sprinkler system on side b. Firefighters were allowed to enter the structure once the utility company confirmed that the power was terminated. The fire was declared under control about 2330hrs. Fire companies remained on scene for quite some time mopping up and picking up the 1000 plus feet of large diameter feeder lines. The Attleboro Fire Department and State Fire Marshal's Office will be determining the cause and origin of this fire.