FILE - In this Dec. 14, 2014, file photo, a masked Palestinian gunman of the Hamas militant group holds a weapon during a rally to commemorate the 27th anniversary of the group in Gaza City. Amnesty International on Wednesday, May 27, 2015, accused the militant group of abducting, torturing and killing Palestinians during the war in the Gaza Strip summer 2014, saying some of the actions amount to war crimes. (AP Photo/Khalil Hamra, File)