Heavy flames and plumes of black smoke could be seen for miles Monday as firefighters battled a massive, explosive fire at a Montgomery County sheet metal plant. The five-alarm fire began at Trico Metal Products, a sheet metal fabricator business on the 2300 block of Wyandotte Road in Upper Moreland around 5:20 p.m. Officials said there were reports of an explosion prior to the blaze. A front wall and back wall of the facility collapsed as numerous explosions from overheated compressed gas cylinders inside the plant put responding firefighters at risk.