UPDATE 1-One critically injured after fire erupts at Midland, Texas, oilfield operations

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Nov 21 (Reuters) - One person was seriously injured in a Midland, Texas, explosion and fire on Thursday involving several storage tanks and a truck used in oilfield operations, according to a hospital spokeswoman and local media reports.

Midland Memorial Hospital received one patient, who was in critical condition after the blast, hospital public relations manager Tasa Richardson said. Richardson declined to provide additional details about the injuries.

Firefighters first responded to the blaze in Southeast Midland at about 10:30 a.m. CST (1630 GMT), CBS7 news reported.

A hot oiler truck, which is used to remove wax deposits from oil wells, and four or five frac tanks that typically hold water or proppant were engulfed in the flames, the news station reported. A firefighter truck also caught fire after fuel spilled onto the ground and spread the blaze, it reported.

It was not immediately clear who owns the tanks. City, county and emergency officials were not available for comment.

Businesses and homes within about a half-mile of the fire have been evacuated, KCBD, an NBC affiliate, reported.

Midland, Texas, is one of the most active oil producing areas in the United States. It includes part of the Permian basin, the largest U.S. shale basin. (Reporting by Devika Krishna Kumar and Laila Kearney in New York and Collin Eaton in Houston Editing by Marguerita Choy and Matthew Lewis)