The attack has further shaken Iran, already facing turmoil in the wake of the American withdraw from Tehran's nuclear deal with world powers and additional USA sanctions that are due in November. "And I am hopeful that cooler, wiser heads will prevail".
Many chanted "death to Israel and America".
At least eight of those killed were Revolutionary Guards personnel.
AFP reporters saw members of the public and the military carrying coffins draped in the Iranian flag, some bearing pictures of the deceased.
Three attackers were also killed and the fourth died later of his injuries, the armed forces said. The body of the fifth assailant had not been identified as it was mixed up with other casualties, Fars said. "You will see that our response will be crushing and devastating and you will regret what you have done", Hossein Salami said in a speech before the funeral of the victims broadcast live on the state television. You will see that our response...
Gen. Esmayeel Kossari, said the reactions in Saudi Arabia and the United Arab Emirates - along with "documents" that he said had been found in Iraq and Syria - were proof that "the Americans gave orders to Riyadh and supported this attack".
Iran appeared to have taken the Ahvaz National Resistance's claim more seriously.
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"It's essential to be fully aware and increase our constructive dialogues to neutralise the plots of enemies who want to create suspicion and disagreement among regional countries", said Ali Shamkhani, the Secretary of Iran's Supreme National Security council.
"We will punish every single one of the terrorists for their actions", he vowed. The photo is watermarked from source.
"The United States stands with the Iranian people and encourages the regime in Tehran to focus on keeping them safe at home", Marquis said in an emailed statement.
Pompeo added that it's Khamenei, not Rouhani, who controls Iran. There has been no reaction from Saudi Arabia or Israel.
The accusation will nearly certainly antagonize Iran's regional foe Saudi Arabia. The oil super-powers are waging a war for influence across the Middle East, backing opposite sides in Syria, Yemen, Iraq and Lebanon. But it is unlikely the IRGC will strike any of these foes directly. He did not elaborate. "A major part of them have already been arrested", he told the crowd.
Saturday's assault, one of the worst against the most powerful force of the Islamic Republic, struck a blow at its security establishment at a time when the U.S. and its Gulf allies are working to isolate Tehran.
'It is not acceptable that the European Union does not blacklist members of these terrorist groups as long as they do not perpetrate a crime on the European soil, ' Qasemi is quoted as saying by Iranian state news agency INRA.
On June 7, 2017 in Tehran, 17 people were killed and dozens wounded in simultaneous attacks on the parliament and on the tomb of revolutionary leader Ayatollah Ruhollah Khomeini - the first inside Iran claimed by IS.