LONDON, March 13 : Oil prices extended their climb on Friday and were on track for weekly gains as disruptions in the Gulf from the Middle East war outweighed U.S. and International Energy Agency measures to ease supply concerns. Brent futures for May rose 88 cents, or 0.9 per cent, to $101.34 a barrel at 0918 GMT, heading for a weekly increase of 9 per cent. U.S. West Texas Intermediate (WTI) crude for April was up 26 cents, or 0.3 per cent, at $95.99 a barrel, set for a 6 per cent uptick for