Canada’s transportation authority imposed new rules on its two largest railroad companies operating in wildfire-ravaged British Columbia as it investigates whether a freight train caused a blaze that destroyed a village two weeks ago.

With the pandemic driving a belated embrace of online shopping in Canada, Amazon .com Inc. has been gobbling up warehouses. That has pushed the vacancy rate in the Toronto area down to just 0.5%, making it the tightest market in North America, if not the world.

Canada is in danger of running out of warehouse space by the end of the year, thanks to the boom in e-commerce sparked by the pandemic.