A Palestinian boy takes part in a military-style summer camp being held by the Islamic Jihad movement during the youngsters' summer school vacation in Khan Younes town, in the southern Gaza Strip, 13 July 2016. Thousands of youngsters between the age of six and 16 can participate in the summer camp where they receive military as well as religious training. (Photo by Hatem Omar/EPA)





Young Palestinians take part in a military-style exercise during a summer camp organised by the Islamic Jihad Movement in Khan Younis in the southern Gaza Strip July 13, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)





A militant walks on young Palestinians during a military-style exercise at a summer camp organised by the Islamic Jihad Movement in Khan Younis in the southern Gaza Strip July 13, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)





Young Palestinians crawl under barbed wire during a military-style exercise at a summer camp organised by the Islamic Jihad Movement in Khan Younis in the southern Gaza Strip July 13, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)





A young Palestinian crawls through a tunnel during a military-style exercise at a summer camp organised by the Islamic Jihad Movement in Khan Younis in the southern Gaza Strip July 13, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)





A young Palestinian takes part in a military-style exercise at a summer camp organised by the Islamic Jihad Movement in Khan Younis in the southern Gaza Strip July 13, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)





Young Palestinians crawl under barbed wire during a military-style exercise at a summer camp organised by the Islamic Jihad Movement in Khan Younis in the southern Gaza Strip July 13, 2016. (Photo by Ibraheem Abu Mustafa/Reuters)