The 30-share Bombay Stock Exchange Sensex slipped by 166.93 points today, to settle at 16,719 after an intraday high of 16,905 and low of 16,683. The 50-share National Stock Exchange Nifty also closed below the 5,000 mark on the back of selling in telecom, technology, FMCG, realty and infrastructure stocks. NIFTY also closed 50.25 points lower at 4969.95 points.Broader market indices also followed suit, with the BSE Midcap index closing 1.29 percent lower and the BSE Smallcap slipping by 1.44 percent.