Tehran, Iran (CNN) Iran's Revolutionary Guards say Saudi Arabia supported ISIS in the deadly twin attacks in Tehran on Wednesday, an accusation likely to infuriate the Saudi kingdom amid high tensions in the region. At least 12 people were killed when six attackers mounted simultaneous gun and suicide bomb assaults on Iran's Parliament building and the tomb of the republic's revolutionary founder, in one of the most audacious assaults to hit Tehran in decades. The targets were highly symbolic. Sunni-majority Saudi Arabia and Shiite-majority Iran have long had a sectarian feud. The rivals are on opposite sides of violent conflicts in Syria, Yemen and elsewhere, and given the tensions, Iran's implication about the attack isn't a great shock.Six attackers went after two highly symbolic targetsUS President Donald Trump says, "... states that sponsor terrorism risk falling victim to the evil they promote"
The attack shocked Tehran: Until now, Iran has largely escaped the regular assaults launched against other participants in _'s civil war.