By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s FTSE 100 index kicked off August on a downbeat note and headed for the lowest close in three weeks on Friday, as investors continued to move out of risky assets against a background of geopolitical concerns and rate-hike fears in the U.S.

The benchmark index slumped 0.7% to 6,681.41, on track for a third straight day in the red.

Risk-sensitive sectors, such as banks and miners, posted the biggest losses as investors remained wary of the fallout from tougher sanctions on Russia, Argentina's selective default and a broader risk-off sentiment triggered on Thursday. U.S. stocks contributed to the downbeat mood after the Dow Jones Industrial Average (DJI) skidded more than 300 points on Thursday, partly due to speculation that solid growth figures could trigger a rate hike.

In London, mining firms declined on Friday, ignoring better-than-expected manufacturing data from China. Shares of Glencore PLC dropped 2.2%, Rio Tinto PLC (RIO) lost 2.1%, and BHP Billiton PLC (BHP) fell 1.7%.

Capita PLC gave up 2.5% after Credit Suisse cut the business-services company to neutral from outperform.

On a more upbeat note, shares of International Consolidated Airlines Group SA rose 2.6% after the airline and British Airways parent reported a jump in second-quarter profit.

Later in the day, attention turns to the U.K. manufacturing purchasing managers' index due at 9:30 a.m. in London, or 4:30 a.m. Eastern Time, followed by the closely watched U.S. nonfarm payrolls data, due at 1:30 p.m. London time, or 8:30 a.m. Eastern Time.

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