Sensex tumbles over 600 points, Nifty below 23,300 amid surge in US bond yields

Mumbai, Sept. 24 -- Indian benchmark indices opened sharply lower as investors digested the impact of the US 10-year Treasury yield crossing 5.10 per cent. Both indices opened with a gap down, with the Sensex falling over 500 points and the Nifty slipping below the 23,300 mark, while the Nifty Priv…