Muslim suicide bombers struck three cities in Saudi Arabia today.
The citizenry of Saudi Arabia is of course 100% Muslim by law. But ISIS, Al Qaeda and other Muslim factions consider the current rulers to be illegitimate.
Casualties were minimal by suicide bomb standards. Two guards were injured outside the US consulate in Jeddah. Two guards were killed and a number of others were injured in a large explosion near the Prophet's Mosque or "Grand Mosque" of Medina. And there may have been no casualties from one or two blasts in the eastern mainly Shiite city of Qatif.
Of course, in each case, the bomber or bombers were blown to bits.
The video below (first highlighted by Vlad Tepes) appears to show panic in the Grand Mosque of Medina. Male worshippers literally run into each other, presumably fearing an additional attack.