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Associated Press
Smoke pours from a fire at the Chevron Richmond Refinery, seen behind Alcatraz Island in San Francisco, Monday, Aug. 6, 2012. Officials have told residents of two Northern California cities to shelter-in-place as a fire at the refinery releases plumes of black smoke. The fire, first reported at 6:40 p.m. Monday, is burning in a process unit at the refinery, officials said. It was sending smoke over the cities of Richmond and San Pablo. (AP Photo/Eric Risberg)

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