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By Kylie MacLellan LONDON (Reuters) – British broadband provider TalkTalk said on Sunday it had hired defense company BAE Systems to investigate a cyber attack that may have led to the theft of personal data from its more than 4 million customers. TalkTalk said on Friday it had received a ransom demand from an unidentified party for the attack, which has led to calls for greater regulation of how companies and public bodies manage personal data. “BAE Systems are supporting us as we investigate this week's cyber attack,” a spokeswoman for TalkTalk said, declining to give further details due to the ongoing investigation