The Sensex at the Bombay Stock Exchange rose 49 points, or 0.3 per cent, to 17,148 in the first five minutes of trade, on Wednesday morning, on renewed buying by investors, amid firm regional bourses. But the Sensex later gave up all its initial gains, on mild selling pressure, to stand 24 points, or 0.1 percent in negative territory, at 17,075, in volatile trade, a short while ago. Other Asian markets in Japan, China, Taiwan, Singapore and South Korea were up by between 0.5 percent and 2.5 percent, today, after the European Union said good progress was made during talks aimed at averting a debt default by Greece. US stocks had ended little changed, overnight, as investors waited to see if the US central bank would offer more economic stimulus.