The Sensex was trading 250 points up at 21,009 points, a shortwhile ago. It regained 21,000-level by surging 264 points in early trade today on increased buying by funds and retailers despite weak IIP data. The industrial production data for November, which was released after the market hours on Friday, contracted to a six-month low of 2.1 per cent.Similarly, the wide-based National Stock Exchange indexNifty was also trading 63 points up at 6,235 points, a shortwhile ago.