Trump's 50% tariffs on metals come into effect

US President Donald Trump has signed an order doubling tariffs on steel and aluminium imports from 25% to 50%.
The move hikes import taxes on the metals, which are used in everything from cars to canned food, for the second time since March.
Trump has said the measures, which came into effect on Wednesday, are intended to secure the future of the American steel industry.
Critics say the protections could wreak havoc on steel producers outside the US, spark retaliation from trade partners, and come at a punishing cost for American s of the metals.
Hours before he hiked the duties, many firms directly affected could hardly believe the plan was moving forward, hoping it would turn out to be temporary or some kind of negotiating ploy.
Even as Trump signed the orders, the UK was granted a carve-out from the measures, leaving duties on its steel and aluminium at 25%, a move Trump said reflected its ongoing trade discussions with the US.
"Always the question with Mr Trump is, is this a tactic or is this a long-term plan">US President Donald Trump has imposed a blanket 10% levy on most goods from trading partners around the world.