Stock markets rattled as China and Canada retaliate against Trump tariffs – business live

02.32 EST Introduction: Stocks fall as Donald Trump imposes tariffs Good morning, and welcome to our rolling coverage of business, the financial markets and the world economy. Fears are growing of a global trade war, after China and Canada retaliated against the US following Donald Trump's decision to impose sweeping tariffs on their exports to the US. Hopes that Trump might have produced a last-minute reprieve were sunk yesterday, when the US president declared that the new 25% tariffs on imports from Canada and Mexico, and a new 10% levy on China, would begin today as scheduled. This rattled Wall…