The accident occurred at around 9:30 a.m. Refinery officials said on-site emergency crews are handling the incident, and the appropriate agencies have been notified.
Three contractors were taken to a local clinics to be evaluated for minor injuries, a refinery spokesperson said.
Refinery officials said the incident will not have an impact to the community.
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Torrance police said there is flaring at the refinery to safely stabilize operations.
The company said it is cooperating with local authorities to determine the cause of the collapse.