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At least four people are injured after a large explosion at an Exxon/Mobil refinery near Houston. The Harris County Sheriff's Office is asking people who live nearby to avoid the area around the refinery but hasn't yet issued any evacuation or shelter-in-place orders. The refinery in Baytown is about a half-hour from downtown Houston and has been in operation for more than a century. It's Exxon/Mobil's biggest refinery in the U.S.