Global stock markets have sunk despite central banks around the world announcing a co-ordinated effort to ease the effects of the coronavirus.
London's FTSE 100 share index fell more than 7% in early trade. Earlier, markets in Asia closed sharply lower.
On Sunday, the US Federal Reserve cut interest rates to almost zero and launched a $700bn stimulus programme.
It was part of co-ordinated action announced alongside the eurozone, the UK, Japan, Canada, and Switzerland.
However, investors are concerned that central banks now have few options left to combat the impact of the pandemic.
