ISIS jihadists said via their propaganda mouthpiece Amaq that "Islamic State fighters attacked a gathering of Iranian forces" in Ahvaz. It was not immediately clear if either group had organized the violence.
Iranian ethnic Arab group Ahvaz National Resistance and Daesh both claimed responsibility for the rare assault in the southwestern city of Ahvaz, but Iranian officials are blaming "a foreign regime" backed by the United States.
A claim of responsibility by the extremist group Islamic State (IS), which also took responsibility for the 2017 twin attacks on the Iranian parliament and the mausoleum of Islamic republic founder Ayatollah Ruhollah Khomeini, was dismissed by a military spokesman.
Two gunmen on a motorcycle wearing khaki uniforms carried out the assault according to Iranian news agency Fars, which is close to the military. The video's authenticity has not yet been confirmed.
In a statement, the foreign office said that Pakistan is against terrorism and stands with the families of victims in this time of grief. "It is Americans who instigate them and provide them with necessary means to commit these crimes", he said.
"The Persian Gulf states are providing monetary, military and political support for these groups", he added, while accusing the U.S. of being "the sponsor of all these small mercenary countries in the region".
Secretary of State Mike Pompeo appeared on Fox News Sunday to talk trade war, Iran, and Friday's report that Deputy Attorney General Rod Rosenstein has proposed ousting President Trump from office using the 25th Amendment.
"America is acting like a bully towards the rest of the world. and thinks it can act based on brute force", said Rouhani.
"But our people will resist, and the government is ready to confront America".
"The Americans will regret what they did because they made a very wrong choice", the president added.
Senior commanders of the Islamic Revolutionary Guards Corps (IRGC) have said the Ahvaz attack was carried out by militants trained by Gulf states and Israel and backed by America.
Qassemi said the British diplomat condemned the attack and said that he would accordingly relay Iran's message of protest to the authorities in London.
"The United States condemns any terrorist attack anywhere, period. We've always stood by that", Nikki Haley, the U.S. ambassador to the United Nations, told CNN.
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That is a hard choice to make, even for world champions, when you're exhausted and you're hurt and you know there's more to come. Paul Hayward, The Daily Telegraph : "These 80,000 sell-outs have become a blessing and a burden for Joshua".
Syrian President Bashar al-Assad and Hezbollah, two of Iran's closest allies, issued statements condemning the attack, with Assad referencing outside involvement and Hezbollah echoing allegations of United States blame. "The thing he's got to do is look at the mirror", the USA envoy to the UN, Nikki Haley told CNN's 'State of the Union, ' referring to Rouhani.
Saudi Arabia hasn't responded to the allegations.
Iranian armed forces members and civilians take shelter.
It answers to Supreme Leader Ayatollah Ali Khamenei and runs its own business empire in Iran, a major oil producer which has been relatively stable compared with Arab states that have grappled with unrest since uprisings in 2011. Women and children scattered with Revolutionary Guard soldiers as heavy gunfire rang out at the parade in Ahvaz, the chaos captured live on state television.
Iran called on Denmark and the Netherlands to extradite the attack's "perpetrators and their accomplices" to stand trial, Irna said, citing foreign ministry spokesman Bahram Qasemi.
Hours after the attack, Iranian officials have increasingly said they suspect Ahvazi separatists for the attack.
"The Saudis' plan is wrong".
Since then, the United States has brought sanctions back into place, despite opposition from European Union partners, China and Russian Federation, and warned that anyone trading with Iran would also be punished. This is the characteristic of Iranians.
As you can imagine, more people are reading The Jerusalem Post than ever before.
"I strongly believe that such terrorist actions will only increase the nationalism sentiment".
The attack occurred a day before Iranian President Hassan Rouhani heads to NY to address the annual United Nations General Assembly next week.
In Tehran, Rouhani watched a military parade that included ballistic missiles capable of reaching Israel and US military bases in the Mideast.
CNN can not verify the authenticity of the video, which Amaq said it "obtained" and published on Sunday, a day after the attack that killed 29 people and wounded 70 others.