Oil prices widened their losses in American trade, with US crude extending the losses for the third straight session after the US oil rig count hit three-year highs, bolstering forecasts of new record highs in US output.
As of 13:10 GMT, US crude fell to $67.40 a barrel from the opening of $68.19, with a session-high at $68.43, and a low at $67.19.
Brent fell to $73.35 a barrel from the opening of $73.76, with a session-high at $74.14, and a low at $73.12.
US crude closed down 0.2% on Friday, the second loss in a row, away from three-year highs at $69.54, while Brent closed flat.
Oil prices rose 1.5% last week, the second weekly profit in a row, as Saudi Arabia targets $80-$100 per barrel prices.
Last Friday, Baker Hughes reported a rise in the US oil rig count last week by 5 rigs to a total of 820 rigs, the highest since March 2015.
US crude output is up nearly 25% from mid-2016 levels past Saudi Arabia's 9.9 bpd levels, and near Russia's 11 million bpd levels.