India, May 25 -- The threat of a catastrophic explosion from a failing chemical tank at GKN Aerospace has been eliminated after an overnight operation, Orange County officials announced Monday.

The incident began Thursday, when a 34,000-gallon storage tank containing about 7,000 gallons of methyl methacrylate (MMA) began leaking and overheating at the GKN Aerospace facility. MMA is a toxic and flammable chemical used in plastics manufacturing.

This prompted mandatory evacuation orders for nearly 50,000 residents across parts of Garden Grove, Buena Park, Anaheim, Stanton, Westminster, and Cypress.

Orange County Fire Authority officials confirmed Monday that the risk of a Boiling Liquid Expanding Vapor Explosion (BLEVE) is now "off the t...