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of issues. at&t saying in a statement, "there is a nationwide issue that is affecting the ability of customers to complete calls between carriers." at&t says a notice they sent to 911 call centers that emergency services were effected but sent in error, and 911 calls are operating normally at this time. back in february, at&t customers in major steps all over the country lost cell service for hours. that included emergency services, 911, in multiple states. and first net, a nationwide network for first responder and police communication. the fcc opened a formal investigation into the cause. which at&t blamed on a technical error while expanding their network. and david, the fcc says it is investigating this issue. it's still unclear how many of at&t's 100 million customers have been effected. david? >> david: you'll stay on it for us. erielle, thank you. in the meantime, now to the dangerous and life-threatening heat wave so early in the season this year.