By Kevin Buckland OTTAWA (Reuters) – Crude oil sank with Treasury yields and the dollar on Thursday as recession worries intensified following the Bank of England’s warning of a drawn-out downturn, which sent sterling tumbling versus the euro. Wall Street stocks searched for direction a day after rallying, with a key U.S. jobs report looming on Friday. The S&P 500 was flat at 4,155 as of 17:41 GMT, following its close at a two-month high in the previous session. The Dow dropped 0.18% to 32,752, from near an almost three-month high. The Nasdaq swung to a 0.2% gain to 13,281, looking to extend a…