Smoke rises from buildings in Ain el-Helweh, Lebanon's largest Palestinian refugee camp, near the southern coastal city of Sidon, during ongoing clashes between Palestinian security forces and Islamist fighters on August 21, 2017. The clashes first broke out on August 17 when gunmen from the small Islamist Badr group opened fire on a position of Palestinian security forces inside the camp, a Palestinian source said. / AFP PHOTO / Mahmoud ZAYYAT (Photo credit should read MAHMOUD ZAYYAT/AFP/Getty Images)