Iran's Supreme National Security Council (SNSC) Ali Shamkhani said on Friday that West's support for Saudi Arabia has encouraged the Saudis to step up their atrocities across the region.

Shamkhani denounced Western double standards in dealing with Saudi crimes against Muslim nations, saying Riyadh serves as the "strategic partner" of the West and Israel in the region.

"Today, the regime that is the root cause of Muslim killings in Iraq, Syria, and Yemen, serves as the strategic ally of the West and Israel, leaving a big question mark over face US claims about human rights," he added.

Riyadh's refusal to apologize to the families of Mina incident victims as well as its failure to identify those guilty fuel the suspicion of the kingdom's complicity in the incident, Shamkhani said.

Shamkhani, who was speaking on the anniversary of the death of those victims further said the tragedy will be a dark stain on Al Saud's reputation forever.

Thousands of people, including 465 Iranians, lost their lives in a crush during Hajj rituals in Mina, Mecca, on September 24, 2015. Iran had the greatest number of deaths among foreign nationals.

Saudi Arabia put the death toll from the crush at 770 and refused to update it later. The regime has so far rejected Iran's call for the formation of a fact-finding committee to investigate the tragedy.

Iranian pilgrims, as a result, did not attend the Hajj rituals this year.