Authorities in Southern California order tens of thousands of residents to evacuate after an industrial chemical storage tank begins leaking and is considered at risk of rupture or explosion. Multiple outlets report that the tank contains roughly 6,000–7,000 gallons (about 22,700–26,500 liters) of methyl methacrylate, a volatile, flammable liquid used in plastic production. Firefighters and other crews work to reduce danger by cooling the damaged tank, including spraying it with water. Officials warn that the situation could worsen if the tank fails, potentially leading to a larger chemical release, toxic fumes, and an explosion. One report cites U.S. EPA leadership saying a low-volume release is most likely, while other coverage emphasizes continued concerns that the tank is heating up. Evacuation numbers vary by outlet—about 40,000 in Garden Grove/Orange County and more than 50,000 overall—reflecting updates as authorities expand or adjust safety zones. Coverage also notes that at least some officials say it does not appear that the most highly volatile components have leaked so far, even as vapors are vented and temperatures rise.