The FTSE 100 and the pound have fallen after a host of polls showed the strengthening of the 'leave' campaign ahead of the UK's referendum on European Union membership next week.
The UK blue-chip index fell 121 points, or 2%, to 5,923 while the pound dropped 1% to $1.413, hovering around a two-month low against the dollar.
That followed three separate polls underlining the lead taken by the 'Brexit' camp ahead of next Thursday's vote. An ICM poll for The Guardian showed 53% backing for leave and 47% for 'remain', once undecideds were excluded.
The leave camp boast an even bigger lead according to a YouGov survey for The Times, which puts them on 46% support versus 39% for remain, with 15% undecided.
It also took the lead in The Telegraph's poll, albeit by a slim margin, with 49% support versus 48% for remain.
Meanwhile, the campaign also received a boost from The Sun newspaper, which backed a UK exit.
Even the betting markets, which have been ascribing a much slimmer possibility to an 'out' vote than the polls, are beginning to turn.
Betting odds now imply only a 55% chance of the UK voting to remain in the EU according to Betfair, down from 78% as recently as Thursday.
European markets were also down on the news. The French CAC 40 fell 1.4%, the German DAX 30 was down 0.7%, Italy's FTSE MIB dropped 0.9% and Spain's Ibex fell 1.1%.
'Equity indices are extending their losses, fearful of a now heightened prospect that the UK votes to leave the European Union, worsening an already fragile global growth situation by delivering an economic and political blow to a struggling eurozone,' said Mike van Dulken, head of research at Accendo Markets.
'Once added to existing concerns about China slowdown and debt bubble, questions about the US economy following a weak jobs report and with a trip of central bank updates yet to come this week, markets have taken another leg lower.'
The pound's fall meanwhile cut short yesterday afternoon's recovery, as rumours the delayed ICM/Guardian poll would hand the lead back to the remain camp proved unfounded.
'The pound gyrated wildly, one moment it was surging on the back of rumours that the EU remain camp had taken back the lead, before plunging once more when the latest official poll put the leave campaign slightly ahead with only nine days to go before the vote,' said Kathleen Brooks, research director at City Index.
'The pound remains an easy target this week unless we see a shift in sentiment towards remaining in the EU over the coming days.'