At approximately 7:30am, Holtsville Truck 7 responded to this working structure fire on Penn St in the Ronkonkoma Fire District. Truck 7 was utilized for mast stream operations due to the heavy fire load and structural instability prior to fire department arrival. Shortly after returning to service, Holtsville Engine 3 responded to the Ronkonkoma Fire District to assist Ronkonkoma and Selden Fire Departments at an overturned vehicle.