Explosion at Valero refinery, huge fire, smoke seen as Texas plant blows up: What we know so far

Valero Energy refinery explosion causes thick smoke; air quality monitoring underway.
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Explosion reported at Valero refinery at Texas' Port Arthur; Shelter-in-place alert issued for residents

The explosion at the 380,000 barrel-per-day refinery is likely to have been caused by an industrial heater, Sheriff Zena ...