European stock indexes accelerated losses to close lower on Tuesday, after seesawing during the trading session.
The pan-European FTSEurofirst 300 dipped into negative territory during the afternoon and closed provisionally lower by 1.0 percent at 1,327.0.
Stocks were hit during late afternoon by reports that national central bankers could be planning to challenge European Central Bank President Mario Draghi on Wednesday over his management and communication style.
Markets originally turned negative after the European Union's executive body slashed its growth outlook for the euro zone.
"The economic and employment situation is not improving fast enough," said European Commission Vice-President Jyrki Katainen in the Commision's autumn economic report.