London, July 5 (BridgeNews) - A profit warning from U.K. telecoms equipment and service provider Marconi PLC (MONI) hung heavy over European stock markets, and ensured all major indices ended in the red. Marconi shares fell more than 50%, and other technology and telecommunication stocks were dragged lower in its wake. Decisions to keep U.K. and European interest rates on hold had been widely expected by investors. At 1600 GMT the FTSE Eurotop 100 Index was down 19 points at 3127 points.