Oil prices are rising amid continued uncertainty over the prospects for resolving the conflict in the Middle East.

October futures for Brent on the London ICE Futures exchange are up $0.61 (0.7%) to $87.68 per barrel. September futures for WTI on the New York Mercantile Exchange (NYMEX) have risen by $0.29 (0.36%) to $81.54 per barrel.

Since the start of this week, prices have risen by about 4%.