Stock markets in Europe and Asia have seen big falls after Greece closed its banks and imposed capital controls.
The moves by the Greek authorities came after the European Central Bank decided not to extend emergency funding.
London's FTSE 100 index fell 2% in early trade. Earlier in Asia, Japan's Nikkei index fell nearly 3%.
On the currency markets, the euro had fallen to $1.0953 at one point in Asian trading from $1.1165 on Friday, but it then recovered some ground.
Elsewhere in Europe, Germany's Dax share index and France's Cac 40 were both down more than 3%. The Athens Stock Exchange and Greek banks are closed all week.
Source: BBC