Nagasaki has marked the 80th anniversary of the U.S. atomic attack on the southern city in Japan. Survivors are determined to make their hometown the last place on Earth hit by a nuclear bomb. About 2,600 people attended a memorial event Saturday at Nagasaki Peace Park. Participants included representatives from more than 90 countries, Japan's prime minister and the mayor of Nagasaki. Survivors have committed to a goal of abolishing nuclear weapons but worry about the world moving in the opposite direction. The U.S. launched the Nagasaki attack on Aug. 9, 1945. It killed tens of thousands of people three days after the bombing of Hiroshima that killed 140,000. Japan surrendered less than a week later to end World War II.