Greek crisis: euro plunges as traders head for safe haven currencies

• What the financial crisis means
• 'A dark day for Greece' as banks close
• Markets brace for turmoil

The euro on Monday lost about 1.5 per cent against the US dollar in one of the strongest signs of the market turmoil about to be unleashed by Greece's failure to agree the terms of a bailout package with its European Union and International Monetary Fund creditors.