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High levels of benzene near the houston-area chemical plant that caught fire this week. casey stiegel live in dallas on that. >> they just had a press conference where they would not give any specific information about the national guard but were working to get more on that. we can tell you this new shelter in place order was just issued early this morning in response to the latest environmental air samples that came back alerting to high levels of a chemical in the air called benzene. it is at ...