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Palestinian kids watching a weapon exhibition at an Hamas-run youth summer camp, in Gaza City, on 21 July 2016. (Photo by Momen Faiz/NurPhoto via Getty Images)

Palestinian kids watching a weapon exhibition at an Hamas-run youth summer camp, in Gaza City, on 21 July 2016.
(Photo by Momen Faiz/NurPhoto via Getty Images)

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Palestinian kids watching a weapon exhibition at an Hamas-run youth summer camp, in Gaza City, on 21 July 2016. (Photo by Momen Faiz/NurPhoto via Getty Images)

Palestinian kids watching a weapon exhibition at an Hamas-run youth summer camp, in Gaza City, on 21 July 2016.
(Photo by Momen Faiz/NurPhoto via Getty Images)

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Palestinian kids watching a weapon exhibition at an Hamas-run youth summer camp, in Gaza City, on 21 July 2016. (Photo by Momen Faiz/NurPhoto via Getty Images)

Palestinian kids watching a weapon exhibition at an Hamas-run youth summer camp, in Gaza City, on 21 July 2016.
(Photo by Momen Faiz/NurPhoto via Getty Images)

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Palestinians walk inside a tunnel used for military exercises during a weapon exhibition at a Hamas-run youth summer camp, in Gaza City, on July 21, 2016. (Photo by Momen Faiz/NurPhoto via Getty Images)

Palestinians walk inside a tunnel used for military exercises during a weapon exhibition at a Hamas-run youth summer camp, in Gaza City, on July 21, 2016. 
(Photo by Momen Faiz/NurPhoto via Getty Images)

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A Palestinian boy holds weapon for a member of the Ezz Al-Din Al Qassam brigade, the military wing of Hamas, during a march along the streets of Gaza City, Saturday, Sept. 14, 2013. Photo: Ahmed Deeb/NurPhoto (Photo by NurPhoto/Corbis via Getty Images)

A Palestinian boy holds weapon for a member of the Ezz Al-Din Al Qassam brigade, the military wing of Hamas, during a march along the streets of Gaza City, Saturday, Sept. 14, 2013. Photo: Ahmed Deeb/NurPhoto (Photo by NurPhoto/Corbis via Getty Images)