LONDON (AP) -- European stocks and the pound fell further on Monday as concern grew over the potential economic costs of Britain's vote to bring its country, the world's fifth-largest economy, out of the European Union.

The British pound, which last week plunged to its lowest level since 1985, dropped another 2.4 percent to $1.3352, despite the British Treasury's reassurances that the economy was strong enough to withstand the uncertainty.

European stock markets added to their painful losses from Friday, when concern over the vote outcome wiped out $2.1 trillion of stock value from Hong Kong to London to New York.

Britain's FTSE 100 was down 1.3 percent at 6,056 while Germany's DAX shed 1.3 percent to 9,434 and France's CAC 40 dropped 1.3 percent as well to 4,053.

Wall Street was set to drift lower on the open, too, with futures for the Dow Jones industrial average and the Standard and Poor's 500 index down 0.3 percent each. Earlier, some Asian markets had bounced back somewhat after news reports said Japanese Prime Minister Shintaro Abe instructed financial officials to take steps to stabilize financial and currency markets.

Traders were watching for more aftershocks as other EU leaders press London to start the complex process of leaving the 28-nation trading bloc. Prime Minister David Cameron wants to wait several months.

"Markets will be nervous given that the EU and U.K. have some mismatch in terms of timing of exit procedures and negotiations," said Mizuho Bank analysts in a report.

"The EU's legitimacy may be tested by separatist parties," it said. "Spanish elections more immediately and then French elections in 2017 add to the complexity of political dynamics involved in negotiations. Brewing uncertainty suggests that the stage is set for potentially stormy global markets."

In the first direct reflection of business sentiment in Britain, a leading business group said Monday that 20 percent of its members plan to move some of their operations outside of the U.K. in light of the country's decision to leave the EU. The Institute of Directors said that a survey of its 1,000 members showed that three out of four believe that Britain's exit from the EU, or Brexit, will be bad for business.

Earlier, Tokyo's Nikkei 225 rallied on the reports of government support for markets in the face of uncertainty. It rose 2.4 percent to close at 15,309.21, rebounding from Friday's 7.9 percent decline, its biggest since the 2008 financial crisis. The Shanghai Composite Index gained 1.2 percent to 2,887.94 and Sydney's S&P-ASX 200 added 0.4 percent to 5,134.20.

Hong Kong's Hang Seng shed 0.2 percent to 20,227.30 and Seoul's Kospi rose 0.1 percent to 1,926.85.

In currency markets, the euro currency used by 19 EU economies declined to $1.1046 from $1.1118. The dollar edged down to 101.99 yen from 102.19.

In energy markets, benchmark U.S. crude rose 13 cents to $47.77 per barrel in electronic trading on the New York Mercantile Exchange. The contract plummeted $2.47 on Friday. Brent crude, used to price international oils, opened down but recovered to gain 27 cents to $49.31 in London. It plunged $2.50 on Friday.