BEIRUT, Lebanon — The images have looped on Saudi television stations. The hospital parking lot where a man blew himself up. The remains of a suicide bomber lying in the street. The black smoke rising near the resting place of the Prophet Muhammad, one of the holiest places in Islam.
Three apparently coordinated attacks in different cities on Monday were a shocking reminder that years after it clamped down on a domestic terrorism campaign by Al Qaeda, Saudi Arabia is again facing a jihadist threat — this time from the Islamic State.