“One bomb hit a Hamas security checkpoint in northern Gaza. A few days later, another exploded in a trash can. Another blew up next to a Gaza City high-rise, and a small one targeted a chicken store owned by a Hamas intelligence official, Saber Siyam. The four attacks in May — among at least a dozen this year, documented by a local human rights group — were aimed not at infidels, collaborators or criminals but at the ruling Islamist group, Hamas. The suspected perpetrators were Hamas’s emerging rivals: extremist Islamist groups that see Hamas as insufficiently pious, and that vow loyalty to the Islamic State.”
Source: ISIS Allies Target Hamas and Energize Gaza Extremists – The New York Times