• About 40,000 people under evacuation orders after a chemical leak in Southern California.
• Evacuations expanded to five cities beyond Garden Grove.
• Hazardous chemical involved is methyl methacrylate, which is volatile and flammable.
• No injuries reported, but authorities stress urgency for safety.
• Containment efforts are ongoing with hazmat teams assessing the situation.

Approximately 40,000 residents have been ordered to evacuate due to a leak of a hazardous chemical from a storage tank at an aerospace facility in Garden Grove, California. The situation escalated on May 22 when officials reported that a tank holding between 6,000 and 7,000 gallons of methyl methacrylate had overheated and begun venting vapors into the air, prompting immediate evacuations in Garden Grove and the expansion of orders to nearby cities including Cypress, Stanton, Anaheim, Buena Park, and Westminster, according to Le Monde and NPR.

Garden Grove Fire Chief Craig Covey emphasized the seriousness of the situation, stating, "This is not precautionary. … This thing is going to fail, and we don't know when." He outlined that the tank could either crack and spill toxic chemicals or potentially explode, which could jeopardize the surrounding area. Local hospitals have been alerted, yet no injuries have been reported thus far according to BBC and NPR.

Efforts are underway to contain the potential spill, with crews placing sandbags around the facility to create barriers and prevent chemicals from entering storm drains or nearby waterways. Chief Covey noted that evacuation centers have been established to assist displaced residents, and emergency responders are working with specialized teams to mitigate the leak's effects. However, he stated they would maintain evacuation orders until further assessments are completed, as the situation remains critical, as reported by Le Monde and BBC.