The FTSE 100 has fallen as much as 3.5% as fresh eurozone concerns pushed the index down to the 4,900 mark.
The S&P 500 closed under 1,100 for the first time since September 2010 as eurozone ministers failed to reach a decision on the second phase of a bailout for Greece.
ETFM brings you a roundup of some of this week's ETF and indexing news.
Tony Raw managing director, global sales at FTSE talks to Clare Dickinson about how the indexing business has developed
The Dow Jones has ended a three day winning streak, with investor sentiment taking a hit from losses in ‘safe haven' commodities.
Markets have broken their three-day rally this morning, forced down by concerns some countries will be forced to take larger writedowns on Greek bonds.
US markets added to their overnight gains on opening this afternoon, following in the footsteps of European markets which have rallied for the second day running.
A strong hint from the European Central Bank it will cut interest rates next month has buoyed markets in early trading, following sharp gains in the US and Asia overnight.
Incomes from annuities have fallen 14% since the start of the year due to stock market turmoil.
The Dow Jones has opened slightly down, following a day of volatile trading in Europe.