The Bombay Stock Exchange benchmark index Sensex today rose by192 points in opening trade. Sensex was at 16920, up by 117 points when reports last came in.Analysts said the rise in Sensex is due to flurry of buying by funds, bolstered by an unexpected announcement of a liberal bonus share issue by Reliance Industries Ltd. Oil and gas, public sector, auto and metal sector stocks are leading the rally.