LONDON, July 20, 2018 (News Wires) - Oil prices came under pressure on Friday from US-China trade tensions and were on course for a third straight week of falls. Brent oil fell 14 cents to $72.44 a barrel by 10:50 GMT. The expiring US West Texas Intermediate (WTI) crude for August delivery was up 8 cents at $69.54 a barrel, while the September contract fell 18 cents to $68.08. US President Donald Trump said in a CNBC interview he was ready to put tariffs on $500 billion of imported goods from China. Lower oil demand in the United States and China caused by an economic slowdown from their trade dispute would likely weigh heavily on markets. The People's Bank of China (PBOC) on Friday reduced its mid-point for the yuan for the seventh straight trading day to the lowest in a year. The yuan then retreated to a near 13-month low though it rebounded later in the day. Trump also said he was concerned that the Chinese currency was "dropping like a rock" and the strong US dollar "puts us at a disadvantage". The United States accounted for about a fifth of global oil demand in 2017, while China consumed around 13 per cent, according to the BP Statistical Review of Energy. A group of Norwegian drilling rigs workers agreed on Thursday to end a strike that began on July 10, removing a threat to oil and gas production in the region. " cting as a further brake on upside potential was the conclusion of an oil workers' strike in Norway," analyst at London brokerage PVM Oil Associates Stephen Brennock said. But prices found some support after OPEC's largest oil producer said it would temper its exports next month.