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thankfully we have heard that building was not hit. first responders are on the scene. this is a brand-new video in. you can see how big this crash was. we'll continue to bring you breaking news from that scene as we get it. >> dana: extreme heat turning more deadly as dangerously high temperatures threaten millions of americans across the southwest. meanwhile that took the old texas power grid is struggling to meet record demand. not a new problem for them but a continuing one and maybe getting worse. casey stiegel is live in dallas with more. hi, casey. >> hi, dana. good morning. a lot of people are concerned about that. relentless, persistent, constant, incessant. a handful of words i picked to describe the summer that won't end in texas and the southwest. in austin, get this. just last week they finally broke a 45-consecutive day period where the mercury was 105