US crude fell 53 cents to $56.59, after settling $1.86 higher in the
previous session, hurt by industry data that showed a surprise build in
domestic crude stocks.
Brent crude was down 9 cents at US $72.49 a barrel at 10:16 am. Earlier on Thursday, the fuel had touched its weakest since July 2010 at US $71.25 a barrel.
Geopolitical tensions could provide some support to oil prices, but conflicts in the ME, North Africa and Ukraine have so far had only limited impact on crude output.