Global stocks

China's government said the devaluation of the yuan was part of reforms meant to make its exchange rate more market-oriented. But the decision has added to worries over slowing growth in the world's second-largest economy and that Western companies might find it harder to sell their goods there.

KEEPING SCORE: France's CAC 40 dropped 0.6 percent to 5,088.22, while Germany's DAX lost 0.2 percent to 11,413.80. Britain's FTSE 100 edged down 0.2 percent to 6,673.48. Greece's stock market fell for a second day since reopening after a five-week shutdown, though its losses were modest at 2 percent.

U.S. shares also appeared to be set to drift lower, with the S&P and Dow futures both 0.2 percent lower.