Stock markets tumble as oil price drop continues

Billions of pounds have been wiped off stocks around the world, because of fears over global growth and plummeting oil prices.

In London, the FTSE 100 index is now down more than 20% below its peak.

The Chief Executive of BP, Bob Dudley, has told the BBC he believes the volatility could continue for months, before oil prices recover.

Kamal Ahmed reports from Davos.

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