Chevron Corporation (NYSE: CVX) said that its subsidiary, Chevron Nigeria Limited (CNL), has called off the search and rescue activities for two contractors who were missing after Monday’s fire aboard the K.S. Endeavor, a drilling rig offshore Nigeria operated by FODE Drilling Nigeria Limited.

“After three days of intensive search and rescue activities for our missing colleagues, I am saddened to report that our efforts have proven unsuccessful and, therefore, we have made the difficult decision to transition to a recovery operation. On behalf of Chevron, we extend our sincere condolences to the families of the missing individuals,” said Andrew Fawthrop, managing director, Chevron’s Nigeria/Mid-Africa Strategic Business Unit.

CNL reports that it is continuing its plans and preparations to drill a relief well, and its investigation into the cause of the incident.

CNL confirms that 152 workers on the shallow water rig and associated barge were safely evacuated from the incident, which occurred about 10 kilometers (6 miles) from shore. Two workers who received medical care for burns have been released from the hospital.

Additional updates on the incident are available at Chevron Updates.

Chevron is one of the world’s leading integrated energy companies, with subsidiaries that conduct business worldwide. The company is involved in virtually every facet of the energy industry. Chevron explores for, produces and transports crude oil and natural gas; refines, markets and distributes transportation fuels and lubricants; manufactures and sells petrochemical products; generates power and produces geothermal energy; provides energy efficiency solutions; and develops the energy resources of the future, including biofuels. Chevron is based in San Ramon, Calif. More information about Chevron is available at www.chevron.com.