Emergency crews are sending an urgent warning that a chemical leak coming from a large storage tank at a Garden Grove aerospace facility could cause a spill or explosion.

California emergency officials were conducting an overnight mission to measure the pressure in a tank at risk of leaking or exploding, which has forced evacuation orders for more than 40,000 Orange Co...

Officials have warned since Friday that the tank, ​which contains methyl methacrylate, a flammable chemical ⁠used in plastics and manufacturing, could rupture and spill up to 7,000 gallons (26,500 lit...