Authorities in Orange county, California, have ordered the evacuation of 40,000 people over concerns about a chemical leak that threatened spillage or an explosion.
The problem arose on Thursday at a facility owned by GKN Aerospace in the city of Garden Grove, where a storage tank holding methyl methacrylate began off-gassing and threatened to fail. The chemical, which is highly flammable, is used to fabricate resins and plastics.