Iran's Revolutionary Guard (IRGC) says its intelligence wing (SAS) foiled a bomb attack Wednesday in Shiraz after a parallel deadly shooting at a shrine there.

"A bombing in Mo'ali Abad Street in Shiraz was detected and foiled by the Revolutionary Guards intelligence," Sepah news said, without giving further details.

There is no possibility to verify IRGC's claim, as the ideological-military-business organization and also Iran's Intelligence Ministry in the past have made numerous similar claims without presenting any evidence. In most cases no public trial of suspects were held or even names released.

The IRGC-linked Fars News quoted “an informed security source in Shiraz” as saying that the remotely-controlled bomb was found and neutralized by security forces and intelligence ministry agents after the gun attack on Shahcheragh shrine.

Wednesday's shooting, which was claimed by the Islamic State (ISIS) group, killed 15 including children and injured dozens more at the Shahcheragh shrine. Officials said they had arrested a gunman who carried out the attack at the shrine. The attack took place amid widespread antigovernment protests across the country which began nearly two months ago following the death in police custody of Mahsa Amini, a 22-year-old Kurdish woman, on September 16.

The Iranian government has organized nationwide demonstrations against the shooting following Friday prayers. Funerals were also due to take place for the victims. Officials said they had arrested a gunman who carried out the attack at the shrine.

Supreme Leader Ali Khamenei vowed on Thursday to retaliate against those threatening the country's security without further elaboration as to whether this meant those responsible for the attack, protesters, or both.

"We will take revenge for the blood of the martyrs of Shiraz," said Tehran Friday prayer Imam Haj Ali Akbari about the attack on the shrine.

Many Iranians did not trust the authorities or believe that ISIS was responsible for the attack. They accuse the regime of being behind the attack or orchestrating it to blame protesters at home for causing unrest and insecurity and justify harsher crackdown against opponents.