Traders in London have been left in limbo after Hurricane Sandy forced Wall Street to shut down for the first time since 9/11.
Investors struggled to find direction after it was confirmed that America's two biggest trading platforms - the New York Stock Exchange and the Nasdaq Stock Market - would not open.
The markets - home to some of the world's biggest companies including Apple, Microsoft and Starbucks - also look set to be closed tomorrow.
The New York Stock Exchange initially said it would only close the market floor but continue using electronic trading - but this was later changed to cover all forms of trading.
A statement from NYSE Euronext, which operates the New York Stock Exchange, said: "We support the consensus of the markets and the regulatory community that the dangerous conditions developing as a result of Hurricane Sandy will make it extremely difficult to ensure the safety of our people and communities, and safety must be our first priority.
"We will work with the industry to determine the next steps in restoring trading as soon as the situation permits."
It is the first time the markets have shut since the four-day stretch in the wake of the attacks on the World Trade Centre on September 11, 2001.