United Arab Emirates exports of aluminium to the U.S. jumped in the first 11 days of March, data from the U.S. Department of Commerce showed, as buyers stocked up on shipments from their second-biggest supplier before the U.

President Donald Trump officially increased tariffs on all steel and aluminium imports to 25 per cent on Wednesday, promising that the taxes would help create US factory jobs at a time when his seesawing tariff threats are jolting the stock market and raising fears of an economic slowdown.