TORONTO — After a gunman rampaged across rural Nova Scotia in 2020, killing 22 people in Canada’s worst mass killing, Prime Minister Justin Trudeau banned some 1,500 makes and models of “military-grade” assault-style firearms and pledged to buy them back from owners.

Now, as Canada’s Liberal government prepares to launch the first phase of the mandatory buyback, several provinces and territories say they won’t help.

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