Iran's hardline Revolutionary Guards said Saudi Arabia's ruling Al Saud family would face a backlash for executing a prominent Shi'ite cleric on Saturday.
"A harsh revenge will strike the Al Saud in the near future and cause the fall of this pro-terrorist, anti-Islamic regime," the Guards said in a statement carried by the Mehr news agency. The Sunni kingdom executed Nimr al-Nimr and three other Shi'ites along with dozens of al Qaeda members, stirring sectarian anger across the region.