US stocks tumbled in after-hours trading as President Donald Trump unveiled sweeping blanket tariffs of at least 10 per cent on imports from around the world.
The SPDR S&P 500 ETF Trust, which tracks the S&P 500, dropped approximately 2 per cent following the announcement.
While the tech-heavy Invesco QQQ ETF, corresponding to the Nasdaq-100 Index, fell even more sharply, shedding 3.3 per cent.
The SPDR Dow Jones Industrial Average ETF Trust also declined, losing 1 per cent in extended trading.
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Companies which had already been suffering from tariff fears continued their decline - both Nvidia and Tesla fell approximately 3 per cent in after-hours trading.
These losses came despite Wednesday's regular trading session ending positively, with the S&P 500 closing 0.7 per cent higher.
The Dow Jones Industrial Average had added 235 points, or 0.6 per cent, while the Nasdaq Composite gained 0.9 per cent.
The broad-based S&P 500 has been under pressure, declining in five out of the past six weeks due to uncertainty caused by Trump's tariff announcements since February.