
A blistering heatwave hit Canada and SLOTXO parts of the US this week, sending temperatures to dangerous highs of nearly 50C (122F).
Hundreds of people have died.
Here's what we know about what is going on.
How bad is it?
Temperature records have been shattered across western Canada and the US Pacific Northwest.
Canada broke its country temperature record for three straight days on Tuesday - 49.6C (121.3F) in the village of Lytton, British Columbia.
A wildfire has now burned 90% of the village and damaged critical infrastructure, local officials say.
Before Sunday, temperatures in the country had never passed 45C.
The heat has been blamed for helping cause the deaths of hundreds in British Columbia.
The US north-west has also seen record highs - and a number of fatalities.
How have people been affected?
The searing temperatures have left many vulnerable people struggling in the sweltering heat.
The region's climate is typically mild, and many homes do not have air conditioning, which might help explain the sudden rise in deaths.
Many have been forced to take refuge in cooling centres - air-conditioned buildings, such as stadiums, where residents can work and sleep.