Such instructions could actually endanger people — citizens receive air strike warnings via smartphone alerts. The Dow Jones Industrial Average fell 230 points, or 0.7%. Meanwhile, the S&P 500 and the Nasdaq Composite dropped 1.3% and 2.2%, respectively. All three indexes began the day with gains before selling off. "This time we received the coordinates of enemy vehicles marked 'V' in Kyiv region," it added. Some privacy experts say Telegram is not secure enough Anastasia Vlasova/Getty Images
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