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Filings show that a Valero refinery explosion and fire were caused by a fluid release.

A release of fluid set off an explosion and ensuing fire ?that forced the temporary shutdown of ?Valero Energy Corp's 380,000-barrel-per-day (bpd) oil refinery ?in ?Port Arthur, Texas, according to a notice the company filed with state pollution regulators on Tuesday.

The people reported that no injuries were reported in connection with the explosion of the Unit 243 Diesel Hydrotreater (47 000 bpd) unit. The date for the restart of the refinery has not been announced.

Valero filed a notice with the Texas Commission on Environmental Quality on Tuesday night stating that an unpredicted release of fluid from Complex 2 caused a?ignition event and multiple process units upsets.

Iran has closed the Strait of Hormuz - a vital waterway for Middle East oil and refined products - in retaliation to U.S. air strikes and Israeli attacks.

Donta Miller is the chief deputy of the Jefferson County Sheriff. She said that on Tuesday, there was no proof the explosion, which could be felt up to 11 miles away (18 km), occurred as a result of someone deliberately attempting to damage a refinery.

Since Monday, online posts have suggested that the Port Arthur refinery blast was caused by sabotage either by Iranian or Israeli agents.

Miller replied, "No we are not looking into it in that way."

Sources said that shutting down the refinery would be necessary to put out the fire by cutting off the flammable materials which were feeding it. As firefighters fought the fire, the refinery's water and steam supply was cut off. Diesel hydrotreaters remove sulfur from motor fuels using hydrogen during production in order to comply with U.S. Environmental Rules.

The fire was extinguished on Tuesday, and the shelter-in place order issued to west?Port Arthur's residents at 6:20 pm CDT (1120 GMT), on Monday?was lifted just before 6 am CDT, on Tuesday. The TCEQ filed states that the Valero refinery closed its large crude distillation units, gasoline-producing 'fluidic catalytic crackers, diesel-producing 'hydrocrackers, cokers and sulfur re-covery units. Hydrotreaters, reformers, alkylation units, and hydrotreaters.

Valero Port Arthur, its largest refinery, is located 86 miles (138 kilometers) east of Houston. (Reporting from Houston by Erwin Seba; Additional reporting in Bengaluru by Ishaan arora and Swati verma; Editing by Susan Fenton and Howard Goller)

(source: Reuters)