(CNN) Last week's record-shattering heat wave across Europe was made at least five times more likely because of climate change, a group of European scientists said Tuesday.

The analysis was published by World Weather Attribution, a partnership made up of several university and governmental weather and climate bodies looking at the possible influence of climate change on extreme weather events

Their findings were based on data collected in Toulouse, France, over the three hottest days of the year so far, June 26-28.

Acting Director of the Environmental Change Institute at Oxford University Friederike Otto, who contributed to the research, told CNN that the findings give the most conservative assessment of the impact of human activity on the heatwave.

"It's important to stress the 'at least'. It's likely to be much higher but this is hard to quantify. Our best estimate is that it's 100 times more. We give the most conservative estimate," Otto said.

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