Twenty-three elementary school children in Tokyo were transported to the hospital Friday morning after complaining of feeling ill during field day events, school officials said.The Tokyo Fire Department said they transported seven boys and 16 girls to the hospital. All were determined to have suffered heat stroke, but none of the cases were serious, officials said.The children, who attend Sunamachi Elementary School in Tokyo's Koto Ward, began to feel ill and sit on the ground around 10:30 in the morning, toward the end of the day's field day program, education committee officials said.The school's field day had originally been slated for Sept. 29, but rain on that day led the school to reschedule the remaining events for Friday. School principal Taichi Miyauchi said he suspected that the high temperatures in the Tokyo area during the day led to the incident. "We believe we took appropriate measures, such as taking the the children to the school sick room. We thought the students would be OK (despite the heat) because they were wearing hats," he said.Temperatures in Tokyo, which saw its first sunny day in a week, rose to 29.2 by 11 a.m.