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.
Torrance police said there is flaring at the refinery to safely stabilize operations.
ExxonMobil is now flaring to safely stabilize operations.— Community Affairs (@TorrancePD) June 20, 2016
The company said it is cooperating with local authorities to determine the cause of the collapse.