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The White House also announced $250 million in grants for the International Development Association, part of the World Bank, to assist poor countries facing crises.

The UK has halved its funding to the World Bank's International Development Association fund to £500m a year.

Banga told a Council on Foreign Relations event that the contributions would come outside the bank's normal shareholding structure and regular country contributions to the International Development Association fund for the poorest countries.

And it plans to expand very low or zero-interest lending, including through a new $6 billion crisis facility set up for the poorest countries through the International Development Association.

The World Bank has committed roughly $5.3 billion for reconstruction and development projects in Afghanistan since 2002 through its International Development Association, according to its website.