The Sensex at the Bombay Stock Exchange, which had lost 155 points in opening trade, today, later slumped as much as 273 points, or 1.4 percent, to stand at 19,661, a short while ago, as selling pressure accelerated. Concerns about a possible domestic fuel price hike after global crude oil prices soared to a 26-month high, and lacklustre regional markets dampened trading sentiment. Elsewhere in Asia, stock markets in Japan, China, Singapore, Hong Kong, and Indonesia were trading mixed, today.