The US leading index has posted the largest weekly loss since March, with a drop of 4.5 percent. The Dow Jones Industrial extended its recent losses and closed 2.24 percent lower at 24,388.95 points.

For the market-wide S & P 500, it fell on Friday by 2.33 percent to 2633.08 points down. The technology index Nasdaq 100 fell 3.30 percent to 6613.28 points. Because of the state day of mourning for the late former 41st President George HW Bush, the trading week was shortened.

With the arrest of Huawei's Chief Financial Officer Meng Wanzhou, investors are worried that the US-China trade dispute will escalate again. The US accuses the manager of the Chinese smartphone manufacturer, have violated US sanctions against Iran. They demand the extradition Mengs, who was arrested in Canada at the request of US authorities. China responded with a furious protest note.

Although US President Donald Trump's economic adviser Larry Kudlow said the conflict is not an obstacle to trade talks with China. And Trump himself had tweeted before: "The China talks are going well!" Analysts said, however, that investors in the statements of the US government have missed concrete clues as to how to avoid Chinese tariff increases.

In the Dow Jones only the papers of the oil company Chevron recorded a small plus. Oil prices had risen sharply after agreement by leading oil states on a surprisingly strong subsidy cut.