A drop in consumer sentiment ruined a bright start on the Dow Jones in morning US trading on Friday, the index dropping into the red after an initial 0.35% spurt.
A consumer confidence index put together by Thomson Reuters and the University of Michigan found sentiment dropped more than two points to 66.6 in September. Economists had projected a figure of 70.
The Dow Jones made early gains on Friday, advancing 0.32% to 10,628.74, before slipping to 10,591, a marginal drop of 0.03%.
Meanwhile, US economic data put the seasonally-adjusted consumer price index for August up 0.3% from July, broadly in line with expectations. The underlying inflation rate remained unchanged, while forecasters had predicted a 0.1% rise.
Early winners on the Dow included Walt Disney, which climbed more than 1% to $34.56, while American Express and Verizon Communications also gained.
In London, the FTSE fell back in afternoon trade after enjoying a brief stint above 5,600 earlier on Friday. Shortly after 3.30pm GMT, the index was down more than 15 points, or 0.28%, at 5,524.
Engineering giant Invensys is one of the day's big winners, gaining almost 3% to 285p, following news its rail division has struck a deal to provide railway signalling to Chinese manufacturer CSR Corporation.
Elsewhere, hire company Aggreko, miner Kazakhmys and retail giant Burberry Group all advanced.
Banking giant Barclays lost 2.61% to 306.55p while hedge fund manager Man Group slipped 2.59% to 229.5p.
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