There are suicide bombings in Saudi Arabia. One happens in the car park of the Prophet's Mosque in Medina. This is the second most important place in Islam. It is 1394 years old. It is the Prophet’s Muhammed’s burial place. Millions of people visit it every year.
Another suicide bomber attacks in the provence of Qatif. Another bomber attacks the US consulate.
People do not know who does these attacks. People think that it is the Islamic State.