Investor concern over the implications of the ongoing riots in France surfaced in the euro on Tuesday but other asset classes were less affected as analysts sought to weigh up the wider implications.

The euro fell to $1.1711 against the dollar, its weakest level since November 2003 in Asian trading as the riots entered a twelfth night. It had recovered to $1.1783 as London-based traders went home on Tuesday but dealers said further violence could provide an excuse for further selling now the single currency had broken through key support levels.