FBI seizing evidence at California plant where chemical tank overheated

Ariel view of the chemical tank at GKN Aerospace in Garden Grove, Calif., on Wednesday. William Liang/AP hide caption toggle caption William Liang/AP LOS ANGELES — Federal authorities served a search warrant on Wednesday at a Southern California aerospace facility where a chemical tank overheated last month, forcing 50,000 residents to evacuate because authorities feared a catastrophic explosion. …