An explosion at a U.S. Steel plant in Clairton, Pennsylvania, left several people injured and many more trapped under the rubble, according to officials. NewsNation’s Alex Caprariello has the latest developments. #Explosion #SteelPlant #Pennsylvania "NewsNation Now" is a no fluff, no filler newscast hosted by Nichole Berlie featuring up-to-the-minute news drawing from a network of journalists across the U.S. Weekdays starting at 12p/11C. NewsNation is your source for fact-based, unbiased news for all Americans. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to watch on TV or streaming: trib.al/Vu0Ikij