Trevor Ault reports on the chemical tank rupture at a paper mill in Washington state, killing at least one person and leaving multiple critically injured, authorities said; Gio Benitez has details on the pilot on a Delta connection flight, operated by Endeavor, declaring an in-flight medical emergency after his first-officer briefly lost consciousness; Faith Abubey has the latest on the growing Ebola outbreak as the CDC sends an "urgent request" to staff for help screening Americans returning from central Africa for potential signs of the virus; and more on tonight’s broadcast of World News Tonight with David Muir.

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