A Palestinian boy is poured with water to stay cool during hot weather on the outskirts of southern Gaza Strip city of Khan Younis, on May 19, 2020. (Photo by Yasser Qudih/Xinhua)

A Palestinian boy is poured with water to stay cool during hot weather on the outskirts of southern Gaza Strip city of Khan Younis, on May 19, 2020. (Photo by Yasser Qudih/Xinhua)

A Palestinian boy is poured with water to stay cool during hot weather on the outskirts of southern Gaza Strip city of Khan Younis, on May 19, 2020. (Photo by Yasser Qudih/Xinhua)

A Palestinian boy is poured with water to stay cool during hot weather on the outskirts of southern Gaza Strip city of Khan Younis, on May 19, 2020. (Photo by Yasser Qudih/Xinhua)

Palestinian children play in a puddle of water to stay cool during hot weather on the outskirts of southern Gaza Strip city of Khan Younis, on May 19, 2020. (Photo by Yasser Qudih/Xinhua)