Europe finished Friday's session on a negative note, as the worst terror attack seen in Spain for more than 13 years added jitters to market sentiment.
Asia markets were pressured after U.S. markets sold off on uncertainty over the Trump administration's ability to follow through on policy.
The dollar fell against a basket of major currencies on Friday in wake of continued political uncertainty.
Oil prices rose on Friday as the stock market strengthened and the U.S. dollar weakened.
Political uncertainty in the United States and a suspected Islamist attack in Spain boosted bullion's safe-haven appeal.
U.S. bond prices fell after President Trump decided to remove chief strategist Steve Bannon.
Equities were staring down their second straight week of losses as investors took note of the negative trading sentiment seen globally.
U.S. equities fell on concerns Trump's recent controversies will not allow him to work with Congress to pass business-friendly legislation.
Markets in Europe closed lower on Thursday as uncertainty surrounding internal U.S. policy continued to weigh on investor sentiment despite tensions easing between the U.S. and North Korea.
Asian shares closed mixed as a rally in the dollar was halted on U.S. political turbulence while markets digested Fed minutes.
Oil prices rose on Thursday on expectations of a hefty stockpile draw at the U.S. oil storage hub at Cushing, Oklahoma.
The dollar rose but was volatile as rumors swirled about the possible resignation of Gary Cohn.
Gold rose for a second day on Thursday after Fed officials hinted that U.S. interest rates could rise more slowly than expected.
U.S. Treasury prices rose as investors grew concerned over fallout from political discord in Washington.
U.S. stock futures pointed to a slightly lower open, as political turbulence coming from the White House capped gains in global trading.
U.S. equities closed higher Wednesday but backlash from the business community against President Donald Trump kept gains in check.
European stocks closed higher on Wednesday afternoon, as geopolitical tensions in the Korean peninsula eased and investors waited braced for the release of minutes from the last Federal Reserve meeting.
Most Asian shares closed higher on Wednesday as investors digested earnings releases from regional corporates and resurgence in the dollar.
The dollar fell on Wednesday after the release of minutes from the Federal Reserve's July meeting.
U.S. crude stocks fell for the seventh consecutive week last week.