Falling for the third straight session, the Sensex at the Bombay Stock Exchange declined 116 points, or 0.6 percent, to close at 18,269, following weak industrial output data, today. The Sensex had lost 110 points in last two trading sessions. The Nifty at the National Stock Exchange lost 35 points, or 0.6 percent, to 5,486. Stock markets in Japan, China, Hong Kong, South Korea and Singapore ended mixed.