Thousands are under evacuation orders in California as officials work to cool off an overheating chemical tank at risk of exploding.

Crews in Southern California are again working through the night to stop a massive tank filled with a toxic chemical from leaking or causing an catastrophic explosion as tens of thousands of residents remain evacuated due to possible health risks and the prospect of damage from a blast.

A potential crack in the bottom of a compromised chemical tank, which has prompted the evacuation of more than 50,000 people in the suburbs of Los Angeles, may prevent a previously feared explosion.

Crews have been working through the weekend to cool a chemical tank and stop it from exploding in Southern California as they worked to avert a disastrous “worst-case” scenario, the incident’s commander said.

One California town is in a state of emergency and 50,000 people are under an evacuation order as a malfunctioning chemical tank at an aerospace plant is overheating and could leak or explode.

Firefighters have found a potential crack in the massive tank filled with a toxic chemical at risk of explosion in Southern California. Interim Fire Chief of Orange County Authority TJ McGovern joins CNN’s Fredricka Whitfield and shares details.

California firefighters will conduct an all-night operation to test the pressure inside a cracked tank at the center of a toxic chemical leak in Orange County, officials said Sunday, as more than 50,000 people remain under evacuation orders.

Firefighters on Saturday were trying to cool a chemical tank “literally on the edge” of exploding in Garden Grove, California, as they worked to avert a disastrous “worst-case” scenario, the incident’s commander said.