The Bombay Stock Exchange benchmark Sensex on Monday lost over 110 points to close below 17,000-point level on brisk selling due to a steep fall on Dubai bourses, signaling that worries of debt crisis are persisting.Extending the losses for the second day in a row, the Sensex declined by 118.40 points to end the day at 16,983.The wide-based National Stock Exchange index Nifty also dropped 42 points to close at 5,066.