The Swiss insurer announced in July that it was considering buying its British counterpart for £5.6bn.
RSA said
that the approach had been unsolicited but that Zurich's decision not
to proceed had not been a result of anything unexpected in the due
diligence process.
Zurich warned profits in its general insurance arm would miss forecasts.
"Given
the deterioration in profitability in certain parts of the General
Insurance business, and following his appointment as General Insurance
CEO, Kristof Terryn is conducting an in-depth review of the business,"
Zurich said in an update on third quarter trading.
