Nearly 900,000 homes in southern Ontario and Quebec were left without power as a result of storms that produced high winds, reaching up to 82 mph
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Four people were killed by falling trees and a woman died when a boat capsized in the Ottawa River.
Power company Hydro One, which covers Ontario, said it would take several days to reconnect every home.
Meanwhile, Hydro Quebec said 550,000 homes there lost power, with nearly 400,000 still suffering outages as of 14:00 GMT (10:00 local time) on Sunday.
The powerful thunderstorm, which lasted more than two hours, felled many trees, disrupted traffic, damaged homes and saw emergency services inundated with calls for help.
Pictures on Canadian media show firefighters and utility workers trying to untangle downed powerlines and poles that are lying over cars on a road in Ottawa.
The town of Uxbridge, about an hour north of Toronto, has declared a state of emergency after the storm left “significant damage in its wake”, a statement said.
Uprooted and overturned
The four people who died from falling trees were in Ontario.
Provincial Police said a 59-year-old man was killed when a tree was uprooted on a golf course in the capital, Ottawa. East of the city, local media reported that a 44-year-old man was killed in Greater Madawaska.
One person died and two others were injured by an uprooted tree at a campsite about 60 miles (100km) from Toronto, and a woman in her 70s was killed while out walking in the suburb of Brampton, in the Greater Toronto area.
In neighbouring province Quebec, police told local media that a 51-year-old woman drowned when a boat overturned in the Ottawa River. Read more from BBC
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