An employees of a foreign exchange trading company works as he is seen between British Union flag and an EU flag in Tokyo, Japan, June 24, 2016. — Photo Reuters

LONDON/SYDNEY — A British vote to leave the European Union sent sterling plunging on Friday and hammered equities across the world as turmoil swept through global markets.

Such a body blow to global confidence could well prevent the Federal Reserve from raising interest rates as planned this year, and might even provoke a new round of emergency policy easing from all the major central banks.

Risk assets were scorched as investors fled to the traditional safe-harbors of top-rated government debt, Japanese yen and gold.

Billions were wiped from share values as FTSE futures fell 7 percent FFIc1, EMINI S&P 500 futures ESc1 5 percent and Japan's Nikkei 225 7.6 percent. European stock markets were set to open more than 10 percent lower.

The British pound collapsed no less than 18 U.S. cents, easily the biggest fall in living memory, to hit its lowest since 1985. The euro in turn slid 3.2 percent to US$1.1012 as investors feared for its very future.

Nearly complete results showed a 51.8/48.2 percent split for leaving, setting the UK on an uncertain path and dealing the largest setback to European efforts to forge greater unity since World War Two.

Sterling sank a staggering 10.1 percent at one point and was slumped at $1.3582, having carved out a range of $1.3228 to $1.5022. The fall was even larger than during the global financial crisis and the currency was moving two or three cents in the blink of an eye.

"It's an extraordinary move for financial markets and also for democracy," said co-head of portfolio investments of London-based currency specialist Millennium Global Richard Benson.

"The market is pricing interest rate cuts from the big central banks and we assume there will be a global liquidity add from them in the next few hours," he added.

The shockwaves affected all asset classes and regions.

The safe-haven yen sprang higher to stand at 102.15 per dollar, having been as low as 106.81 at one stage. The dollar decline of 4 percent was the largest since 1998.

That prompted warnings from Japanese officials that excessive forex moves were undesirable. Indeed, traders were wary in case global central banks chose to step in to calm the volatility.

One source told Reuters the Bank of England was in touch with other major central banks ahead of the market open there and the Bank of Japan Governor Haruhiko Kuroda it was ready to provide liquidity if needed to ensure market stability.

Other currencies across Asia and in eastern Europe as it woke up suffered badly on worries that alarmed investors could pull funds out of emerging markets. Poland, where many of the eastern Europeans in Britain come from, saw its zloty slump 7 percent.

RECESSION FEARS

Europe's natural safety play, the 10-year German government bond, surged to send its yields tumbling back into negative territory and a new record low.

MSCI's broadest index of Asia-Pacific shares outside Japan slid almost 5 percent, while Shanghai stocks lost 1.1 percent.

Financial markets have been gripped for months by worries about what Brexit, or a British exit from the European Union, would mean for Europe's stability.

"Obviously, there will be a large spill-over effects across all global economies if the "Leave" vote wins. Not only will the UK go into recession, Europe will follow suit," was the gloomy prediction of Matt Sherwood, head of investment strategy at fund manager Perpetual in Sydney.

Investors duly stampeded to sovereign bonds, with U.S. 10-year Treasury futures jumping over 2 points in an extremely rare move for Asian hours.

Yields on the cash note fell 24 basis points to 1.49 percent, the steepest one-day drop since 2009 and the lowest yield since 2012.

The rally did not extend to UK bonds, however, as ratings agency Standard and Poor's has warned it would likely downgrade the country's triple A rating if it left the EU.

Yields on 10-year gilts were indicated up 20 basis points at around 1.57 percent, meaning higher borrowing costs for a UK government already struggling with a large budget deficit. Standard and Poor's has said it will strip the UK of its triple A credit rating.

Across the Atlantic, investors were pricing in even less chance of another hike in U.S. interest rates given the Federal Reserve had cited a British exit from the EU as one reason to be cautious on tightening.

"It adds weight to the camp that the Fed would be on hold. A July (hike) is definitely off the table," Mike Baele, managing director with the private client reserve group at U.S. Bank in Portland, Oregon.

Fed funds futures were even toying with the chance that the next move could be a cut in U.S. rates.

Commodities likewise swung lower as a Brexit would be seen as a major threat to global growth. U.S. crude CLc1 shed $3.00 to $47.11 a barrel in erratic trade while Brent LCOc1 fell as much as 6 percent to $47.83 before clawing back to $48.18.

Industrial metal copper CMCU3 sank 3 percent but gold galloped more than 6 percent higher thanks to its perceived safe haven status. — REUTERS