This photo released on Saturday, May 31, 2015 by a militant website, which has been verified and is consistent with other AP reporting, shows a flag of the Islamic State group placed on a damaged helicopter at Tadmur military airbase, which was captured by the Islamic State group in Palmyra in Homs province, Syria. The Syrian military has suffered a series of setbacks in northern Syria recently as insurgents captured the city of Idlib and almost all of Idlib province. The IS group has also seized Palmyra earlier this month after government forces fled the area. (Militant website via AP)