Stock market today: Sensex opens 500 points down, Nifty50 slips below 22,700

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HDFC Bank probes 2 executives for leak of sensitive informationCarmakers look to Diwali to rev up salesRBI rejects all 224 bids in treasury-bill auctionsRate hike: RBI more hawkish than external members at meetSecurity flaw: eMudhra shares take a hit, fall 20%