Massive NJ warehouse fire destroys block; toxic smoke, possible welding cause

Fire crews in Belleville, New Jersey are still battling hot spots after a massive warehouse fire tore through a mattress factory, destroying nearly an entire block and damaging nearby homes. Officials say toxic smoke and chemicals filled the air, forcing school closures due to safety concerns. Surveillance video appears to show a worker handling equipment—possibly welding tools—just before flames erupted, but the exact cause remains under investigation.