MEXICO CITY, May 5 (Reuters) - Mexico's national oil company, Pemex, said a fire at its Ciudad Madero refinery in northern Tamaulipas state was extinguished within 30 minutes..

Pemex PEMX.UL said in a statement on Monday that the early morning fire, which was reported at a oil pump in the refinery's coking plant, did not cause any injuries or affect output.

The Ciudad Madero refinery is the smallest of Pemex's six domestic refineries, with a total crude processing capacity of 190,000 barrels per day.

(Reporting by Ana Isabel Martinez; Editing by Steve Orlofsky)

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Keywords: MEXICO OIL/