Yurima Izaguirre uses a cell phone flashlight due to a blackout as she wakes her children up to get them ready for their first day of back to school in Minas, Cuba's Havana province, Tuesday, Sept. 1, 2026. (AP Photo/Ramon Espinosa)

Girls hug as they arrive to school for their first day back to classes in Minas, Cuba's Havana province, Tuesday, Sept. 1, 2026. (AP Photo/Ramon Espinosa)

School children enter an underground school on their first day back, in Kharkiv, Ukraine, Tuesday, Sept. 1, 2026. (AP Photo/Andrii Marienko)

School children enter an underground school on their first day back, in Kharkiv, Ukraine, Tuesday, Sept. 1, 2026. (AP Photo/Andrii Marienko)

Children play in an underground shelter during an air raid alarm during the traditional back to school celebrations in Kyiv, Tuesday, Sept. 1, 2026. (AP Photo/Francisco Seco)

Teachers conduct online lessons for elementary students from a public school damaged by a Russian attack, in Kyiv, Tuesday, Sept. 1, 2026. (AP Photo/Dan Bashakov)

Yevhen Yurko, 41, and his son Darii, a 6-year-old first-grader, pose for a photo in the courtyard of a public school damaged by a Russian attack, in Kyiv, Tuesday, Sept. 1, 2026. (AP Photo/Dan Bashakov) CORRECTION: Name of child corrected from Dayri to Darii.

Palestinians carry the body of Abdullah Hamouda, 14, who, according to health authorities, was killed in an Israeli military strike, during his funeral in Gaza City, Tuesday, Sept. 1, 2026. (AP Photo/Jehad Alshrafi)