LEETSDALE, Pa. (AP) — Workers at a Pennsylvania warehouse were pouring hydraulic fracturing chemicals into a production tank Tuesday when a fire started, forcing residents from more than 70 nearby homes and injuring four people, emergency and company officials said. Hazardous materials crews moved people living near the warehouse in Leetsdale to a high school gymnasium as a precaution. The warehouse about 15 miles northwest of Pittsburgh is owned by Lubrizol Corp. The company and Allegheny County Emergency Services Chief Alvin Henderson said three employees were injured. One reportedly had a burned hand and two inhaled fumes, Henderson said. A firefighter also was being evaluated for...
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