From the bombing in Saudi Arabia, it killed four security guards at Mosque in Medinain the end of Ramadan. Moreover, at the same time when the Medina bombed, two other also bashed an explosion near a mosque in the eastern city of Qatif. Many people has been suspecting that it was responsible to ISIS. In my opinion, I agree with the statement, this situation is concern with ISIS.
I think their purpose is to kill muslim people, the attacker was intending to bash the mosque that had thousands of worshippers were celebrating. Due to some Saudi people are a part of ISIS, they think having the Saudi monarchy is betrayed Islam. That makes them did this situation to threaten people and the government. I think it kind of a pressure for government to deal with this situation