Marathon Oil Corporation announced unaudited consolidated earnings and operating results for the first quarter ended March 31, 2013. For the quarter, the company reported total revenues and other income of $4,106 million against $4,040 million a year ago. Income from operations was $1,480 million against $1,394 million a year ago. Income from operations before income taxes was $1,408 million against $1,344 million a year ago. Net income was $383 million or $0.54 basic and diluted per share against $417 million or $0.45 basic and diluted per share a year ago. Adjusted net income was $361 million or $0.51 diluted per share against $478 million or $0.55 diluted per share a year ago. Total capital expenditures were $1,270 million against $1,063 million a year ago. Cash flow from operations was $1,528 million. For the quarter, the company reported net production available for sale of 517 mboed. For the quarter, the company reported impairments of $38 million against $262 million a year ago. The company expects production available for sale in the second quarter of 2013 is expected to be lower than the first quarter. This anticipated decrease is a result of a planned turnaround in Equatorial Guinea, the disposition of the company's Alaska assets and anticipated field declines in Norway.

Marathon Oil Sands Mining announced unaudited earnings and operating results for the first quarter ended March 31, 2013. For the quarter, the company reported income of $38 million against $38 million a year ago. Capital expenditures were $30 million against $44 million a year ago. For the quarter, the company reported net production available for sale of 44 mboed. The company provides operating guidance for the second quarter ending June 30, 2013. For the second quarter, the company expects net production available for sale of 40 mboed to 44 mboed.

Macuga, Liddle & Dubin and Hertz Schram announced that they filed a class action complaint on May 6, 2013 in Wayne County Circuit Court against Marathon Oil Company on behalf of area residents who were evacuated from their homes this past weekend's oil refinery fire. The complaint states that on April 27, 2013 at approximately 6 p.m., an explosion occurred at the Marathon Oil Refinery located at 1300 S. Fort Street in the City of Detroit. The complaint further asserts that the explosion and the subsequent fire caused thick, black smoke to blanket the surrounding residential area. According to complaint, residents up to a mile away reported feeling their homes shake from the explosions. Court documents state that authorities in Melvindale ordered a mandatory evacuation of about 3,000 residents, 1/3 of its population, within a 9-block area. Court documents further allege that the residents were not allowed to return to their homes for several hours while firefighters battled the blaze. The class action complaint seeks monetary damages in excess of $25,000.