An explosion at a U.S. Steel plant near Pittsburgh left two dead and sent at least 10 to hospitals Monday and heavily damaged the sprawling facility, officials said. One worker was pulled from the wreckage alive hours after the explosion sent black smoke spiraling into the midday sky in the Mon Valley, a region of the state synonymous with steel for more than a century. Allegheny County Emergency Services said a fire at the plant started around 10:51 a.m. Authorities later said a second person had died. MORE: https://www.wthr.com/article/news/nation-world/explosion-us-steel-coking-plant-in-pennsylvania/507-efb85944-cc35-474c-8fed-0f11699ed9ea