Sebi said data, emails and other documents are being retrieved from the seized devices and detailed investigation is in progress. Despite Telegram's origins, its approach to users' security has privacy advocates worried. 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. Anastasia Vlasova/Getty Images Some privacy experts say Telegram is not secure enough
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