Massive Tracy warehouse blaze rages into third day, triggering air-quality alerts

Firefighters in Tracy, California battle a roughly 1 million-square-foot Medline warehouse blaze into its third day, prompting air-quality warnings as residents are urged to stay indoors; the cause is under investigation, with early firefighting hampered by possible sprinkler failure and low hydrant pressure; about 5,000 gallons per minute are being pumped, and authorities expect several more days of effort before demolition and relocation of operations.