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The pan-European STOXX 600 and FTSEurofirst 300 indexes fell 0.6 percent and 0.5 percent respectively by 0710 GMT. Both indexes had lost 0.5 percent on Wednesday, snapping a two-day winning streak.
Vodafone fell 3.8 percent, making it the second biggest loser on the FTSEurofirst, after it traded without entitlement to its latest dividend payout.
Among the biggest fallers on the STOXX 600, Essentra fell 23 percent after it warned of lower full-year profit citing challenging market conditions in filter products and delays in some large projects.
All sectors were in the red. The STOXX 600 Basic Resources index outperformed and was down just 0.1 percent, helped by firmer copper prices.