Officials in Southern California say they have found a crack in a damaged industrial tank containing highly flammable and toxic chemicals, prompting large-scale evacuations in nearby communities. Multiple outlets report that the tank holds roughly 7,000 gallons of chemicals and that the crack is located at or near the bottom of the tank. Authorities describe the crack as a potentially positive development because it may allow pressure to be relieved, which could reduce the likelihood of a catastrophic rupture or explosion. Experts referenced by CBS and NBC say a crack could mean an explosion risk might still exist, depending on the tank’s condition and how the chemical contents behave. Despite the possibility that the crack lowers pressure, officials continue to treat the situation as serious. NBC and CBS report thousands of people are evacuated from communities in Orange County, with figures cited near 50,000 residents. Authorities are working to verify the extent and impact of the crack and to manage the incident while evacuations remain in place.