The recent bombings at Medina, Qatif and Jeddah in Saudi Arabia, killing four people might have been done by the Riyadh government. According to a prominent Palestinian journalist, Abdel Bari Atwan, the bombings were done so that the Saudi government can also claim to be a victim of ISIS and use that to push forward its own political agendas.
According to Atwan, unlike most bombings done by ISIS in the past, the group never claimed responsibility for the attack in Medina, or any of the other 2 cities. We saw how the group was fast to claim responsibility for the bombings in Belgium, Bangladesh, France and other part of the world, it had bombed, a move which raises a bigger question on why it never claimed responsibility for Saudi attack.
Saudi Arabia has always opposed the government of Syrian President Bashar al-Assad, and had asked for a green light to deploy its troops into Syria to fight ISIS, but was never given the green light by Washington, and when the bombing occurred, Saudi Foreign Minister Adel al-Jubeir went to Washington to once again offer to send troops to Syria to fight ISIS.
Atwan has said that the US secretary of state is currently looking at Jubeir offer, and the recent "planned bombing" might have been done to soften the ground to lay good points on Jubeir offer.