London (AFP) - The London stock market sank Thursday as Britons voted in a general election set to be the closest in a generation.
The capital's FTSE 100 index of leading companies slumped 0.67 percent to close at 6,886.95 points.
"It is hard to ignore the (British) election?s impact on the FTSE," said Connor Campbell, Spreadex financial analyst. "When placed in context the FTSE?s current losses become even more remarkable; in nine out of the last 11 election days the UK index has risen."
The eurozone's main markets closed mixed with Frankfurt's DAX 30 index up 0.51 percent to 11,407.97 points, while the Paris CAC 40 lost 0.29 percent to 4,967.22 points compared with Wednesday's close, with jitters over the Greek debt crisis also driving down stocks.
Eurogroup chief Jeroen Dijsselbloem said in an interview with Le Monde published Thursday that it would be "politically impossible" to wipe out the face-value of Greek debt.
"The discussion on a reduction of the debt is not taboo. The only thing that would be politically impossible would be to wipe out its face-value" (around 320 billion euros), said Dijsselbloem, who is the Dutch finance minister.
Madrid stocks ended the day with modest gains of 0.15 percent, after Spain enjoyed negative interest rates on its medium-term debt for the first time since a crippling economic crisis.
British voters went to the polls Thursday to decide between the main rivals, Prime Minister David Cameron's centre-right Conservatives and Ed Miliband's centre-left Labour.
"Judging from recent opinion polls, today?s general election is likely to be the closest for at least a generation," said analyst Nick Stamenkovic at RIA Capital Markets.
"Conservatives and the Labour party are neck and neck with neither party likely to achieve an overall majority."
While the leaders of both main parties insist they can win a clear majority in the 650-seat House of Commons, they will almost certainly have to work with smaller parties to form a new government.
If neither the Conservatives nor Labour win a clear majority, they will start days and possibly weeks of negotiations to try to build a bloc of about 326 seats.
- Dead heat in polls -
The last three polls released on Wednesday showed a dead heat between the two main parties, tied at 34 percent, 35 percent and 31.4 percent.
Analyst Mike van Dulken at trading firm Accendo Markets said the election was "a cause for concern, as markets hazard guesses as to what kind of coalition we will inevitably end up with, how complicated it will be and how long it will take to put together".
In foreign exchange deals in London, the pound sank on election jitters to $1.5216 from $1.5247.
"You do not need a particularly long memory to recall the pound's nosedive after the 2010 election, when it took the Conservatives and Liberal Democrats an agonising five days to form the coalition government," said Currencies Direct analyst Phil McHugh.
- Days of uncertainty? -
"Political uncertainty is never good news for a currency, and with more minority parties at the negotiating table this year we should be bracing ourselves for more than five days of uncertainty," added McHugh.
"The poll result -- or lack of one -- should be known early Friday morning."
The European single currency meanwhile slipped to $1.1285 from $1.1348 late in New York on Wednesday.
Wall Street stocks posted gains Thursday after a two-day losing streak and as investors looked ahead to the April US jobs report.
At mid-day in New York, the Dow Jones Industrial Average was up 0.43 percent at 17,918.02 points.
The broad-based S&P 500 rose 0.35 percent to 2,087.47 points, while the tech-rich Nasdaq Composite Index climbed 0.65 percent to 4,942.02..
Asian shares fell Thursday after Wall Street on Wednesday dropped on weaker-than-expected US economic data and a warning from Federal Reserve Chair Janet Yellen that stock valuations were "quite high".
Tokyo stocks fell 1.23 percent after a three-day holiday, Sydney fell for the third straight day, and mainland Chinese markets were also lower on worries regulators may tighten control over margin trading.