US officials credit overnight cooling and monitoring for stabilising tank after leak fears triggered mass evacuationFirefighters contending with an overheating tank of hazardous chemicals in southern California said they had eliminated the threat of the tank exploding in an overnight operation, Oran ge County fire officials said on Monday.The damaged chemical tank in southern California had cracked over the weekend, which authorities were hopeful would relieve pressure and reduce the risk of an explosion. Continue reading... ...read more read less