Brent crude extended its rally on Tuesday, moving further away from six-year lows hit in January, but some analysts warned that prices had risen too far and could face a downward correction. Benchmark Brent crude futures were trading up 50 cents at $61.90 a barrel by 0420 GMT (11.20 p.m. EST), while U.S. WTI crude had risen 26 cents to $53.04 a barrel. “The recent bullishness is not heavily backed by technical and fundamental analysis, and so should not last,” said Daniel Ang of Singapore-based Phillip Futures.