Oil price plunges almost 30% as Saudis vow to step up production

Move follows Russian refusal to join Opec-led production cut aimed at keeping prices high

The price of crude oil has plunged by almost 27% after Saudi Arabia, the world's top oil exporter, said it would step up production from next month, flooding global markets and most likely depressing petrol and diesel prices.

Brent crude was at $33.09 a barrel on Monday morning, a fall of 27%. It was the worst one-day fall for Brent since the start of the first Gulf war in 1991. US crude fell 27% to $30.

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