50,000 California residents are waiting to see if officials can keep this chemical tank from exploding

A damaged chemical tank in Southern California cracked over the weekend, which authorities were hopeful would relieve pressure and reduce the risk of an explosion.Some 50,000 residents in Garden Grove, a city of roughly 170,000 about 40 miles (60 kilometers) south of downtown Los Angeles, have been evacuated and are waiting for a resolution. The tank overheated Thursday and began venting vapors, leaving local and state officials scrambling to evade a worst possible scenario at the aerospace company site.No injuries have been reported.Fire officials planned to send in a team for “an all-night mission” to determine if the pressure has been relieved, which would reduce the worst-case scenario of an explosion, Orange County Fire Authority interim chief TJ McGovern said in a video posted late Sunday to the agency’s X account.“We are not there yet,” McGovern said, urging residents to stay out of the evacuation zone while crews continued operations overnight.In a follow-up update posted on X, the Orange County Fire Authority said there was one known crack on the tank, disputing reports circulating online of multiple cracks. Officials also said there was no active leak and that continuous atmospheric monitoring confirmed no chemicals were escaping from the tank.Firefighters have repeatedly sprayed the tank with water in an attempt to cool the chemical inside, methyl methacrylate, which is used to make plastic parts. The tank’s interior reached 100 degrees (37.7 Celsius) Sunday, an increase of 10 degrees Fahrenheit (5.5 Celsius) since Saturday, according to Democratic state Sen. Tom Umberg.Fire officials said a crack discovered in the tank over the weekend may have helped relieve pressure, reducing the risk of a catastrophic explosion. Officials working to prevent a disaster Gov. Gavin Newsom declared a state of emergency Saturday and said he asked President Donald Trump to issue an emergency declaration to bolster federal support for loca