Mining sector companies were the heaviest fallers in early trading as the Federal Open Market Committee failed to offer fresh stimulus for the US economy.
Just two companies, supermarket chain Morrisons and interdealer broker ICAP, rose in early trading.
Morrisons, the strongest riser, increased by 0.4% to 317.3p, while ICAP climbed 0.1% higher to 331.3p (at 0804 GMT).
The biggest faller was precious metals miner Fresnillo, dropping 4.5% to 1,606p (at 0805 GMT). It was joined by mining peers Antofagasta, down 2.6% to 1,148p; Kazakhmys, which dropped 2.4% to 873.5p; and Rio Tinto which slipped 2.2% to 3,116p.
Asset manager Ashmore was the only non-mining company in the bottom five, slipping 2.4% to 319p.
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