Hundreds of firefighters are battling wildfires in Spain’s Catalonia region, as temperatures soared to 40C (104F) across parts of Europe.
Officials say the fires are the worst in the region for 20 years and may spread rapidly.
Spain, France and Italy are experiencing extreme heat. On Wednesday Germany, Poland and the Czech Republic saw highest ever June temperatures.
Meteorologists say hot air drawn in from northern Africa is responsible.
The heat is expected to rise further in many countries over the next three days, meteorologists warn.
By mid-afternoon temperatures had reached 39C in Turin in Italy, 41C in the Spanish city of Zaragoza, and 40C in Avignon in southern France.
What is happening in Catalonia?
At least 4,000 hectares (10,000 acres) are affected by the wildfires, near the town of La Torre de l’Espanyol, 80km from the coastal city of Tarragona.
Officials said that in the intense heat the area of the fire could increase to 20,000ha.
At least 30 people have been evacuated and five roads have been closed. There have been no reports of casualties.
Regional interior minister Miquel Buch told Catalan radio the fire might have been caused by “an accumulation of manure in a farm that generated enough heat to explode and generate sparks”.
In total, 11 provinces in the east and centre of Spain have experienced or are set to experience temperatures above 40C. In parts of the north-east, they may reach 45C.
What about elsewhere in southwestern Europe?
Temperatures are expected to top 40C in Italy too, particularly in central and northern regions. Several cities, including Rome, have issued the highest heat warnings.
On Thursday morning the body of a 72-year-old homeless Romanian man was found near Milan’s central train station. Officials say the heat may have been a factor in his death.
Philip Trackfield, a British tourist in Rome, told the BBC: “Last night at the Spanish steps it was 41C. It’s exhausting when you’re trying to do all the sights.”
Meanwhile the whole of France – where a heatwave in 2003 was blamed for 15,000 deaths – is now on orange alert, the second-highest warning level.
In Paris, fountains and sprinklers connected to hydrants have been set up. Some schools have delayed important exams and even closed.
In Toulouse, where temperatures are expected to reach 41C on Thursday, charities have been handing out water to homeless people.
How hot was Wednesday?
Temperatures have been climbing in recent days. On Wednesday, Coschen in Brandenburg peaked at 38.6C – a new German record for June.
Radzyn in Poland and Doksany in the Czech Republic also recorded new national highs, with temperatures hitting 38.2C and 38.9C respectively.
Even in the high-altitude Alps, temperatures topped 30C in places. Parts of Austria recorded their local all-time highest temperatures on Wednesday.
While the UK will avoid the worst of the heat, parts of the country – including London – are expected to see temperatures top 30C on Saturday.
Is climate change to blame?
Linking a single event to global warming is complicated.
While extreme weather events like heatwaves occur naturally, experts say these will happen more often because of climate change.
Records going back to the late 19th Century show that the average temperature of the Earth’s surface has increased by about one degree since industrialisation.
A climatology institute in Potsdam, Germany, says Europe’s five hottest summers since 1500 have all been in the 21st Century.
Scientists are concerned that rapid warming linked to human use of fossil fuel has serious implications for the stability of the planet’s climate.
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