PARIS, Oct 31 — Shares in French automaker PSA tumbled today while those in Fiat Chrysler raced ahead after the companies unveiled details of their plans for a merger of equals.

PSA shares fell nearly nine per cent as trading got underway in Paris, erasing gains of four per cent yesterday.

Meanwhile in Milan, shares in Fiat Chrysler rose 10.6 per cent at the opening bell today, adding to a nine per cent gain yesterday. — AFP