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A participant dives into a mud pool during the Mud Day athletic event at El Goloso Military base on the outskirts of Madrid, Spain, Saturday, June 11, 2016. Thousands of athletes got covered in mud as they celebrated International Mud Day running a 13-kilometer obstacle course on a sunny Saturday with heatwave-like temperatures up to a 29 degrees Celcius (around 84 degrees Fahrenheit). (AP Photo/Paul White)

Three youths take advantage of a public shower to cool off from the summer heat during the holy, fasting month of Ramadan, when observant Muslims abstain from food and water during daylight hours, in Baghdad, Iraq, Saturday, June, 11, 2016. (AP Photo/Karim Kadim)

A soldier collapses on Horse Guards Parade ahead of the Queen's Birthday Parade, 'Trooping the Colour', in London on June 11, 2016. Trooping The Colour and the fly-past are part of a weekend of events to celebrate the Queen's 90th birthday. / AFP PHOTO / OLI SCARFFOLI SCARFF/AFP/Getty Images

Heat waves distort this image of drivers following the pace car during the NASCAR Xfinity series auto race at Michigan International Speedway, Saturday, June 11, 2016 in Brooklyn, Mich. (AP Photo/Carlos Osorio)

TOPSHOT - Albania's midfielder Ergys Kace (L) pulls down the shorts of Switzerland's midfielder Valon Behrami during the Euro 2016 group A football match between Albania and Switzerland the Bollaert-Delelis Stadium in Lens on June 11, 2016. / AFP PHOTO / Denis CHARLETDENIS CHARLET/AFP/Getty Images

A participant performs during the Kiev Fire Fest in Kiev, Ukraine, Saturday, June 11, 2016. (AP Photo/Sergei Chuzavkov)