An Iranian military spokesman said the gunmen were trained by two Gulf Arab states and had ties to the U.S. and Israel.
- Gunmen disguised as soldiers attacked an annual Iranian military parade Saturday in the country's oil-rich southwest, killing at least 25 people and wounding 60 in the bloodiest assault to strike the country in recent years. At least 53 others were wounded, including some who were in critical condition.
Washington has said that it is ready to open talks on a new agreement to replace the July 2015 accord, but Tehran has said repeatedly it can not negotiate under the pressure of the sanctions.
Pointing to the media war against Iran claiming that Iran trains and funds terrorists, Shekarchi said today's terrorist attack and the brutal massacure of innocent people, children, disabled war veterans and soldiers prove that the Islamic Republic of Iran itself is the victim of terrorism. Two of them were killed and two others were detained.
He blamed regional countries and their "US masters" for the attack, adding that Iran would respond "swiftly and decisively".
The Guards have a big say in Iran's regional interests and a vast stake worth billions of dollars in Iran's economy.
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The assailants had hidden weapons in an area near the parade route several days in advance, said Brigadier General Abolfazl Shekarchi, a senior spokesman for Iran's armed forces. However, Arab separatist groups in the region have launched attacks on oil pipelines there. Neither claim provided evidence.
It was not immediately known who was responsible for the assault in Ahvaz, where gunfire sprayed into a crowd of marching Revolutionary Guards, bystanders and government officials watching from a nearby reviewing stand.
Ahwaz is the center of a province that has a large Arab minority and there are a number of groups that have opposed the Iranian regime from Ahvaz over the years.
The Islamic State group claimed responsibility for a deadly shooting at a military parade in southwestern Iran on Saturday, its propaganda agency Amaq said.
"We will never decrease our defensive capabilities. we will increase them day by day", Mr Rouhani said at a separate military parade in the capital.
A general view of the attack during the military parade in Ahvaz, Iran September 22, 2018.
According to local media, the terrorists also meant to attack the military commanders and officials on the podium but they were wounded by the security forces.
Iran will face pressure to respond to the high-profile attack on the Revolutionary Guards, the strategic force with the greatest commitment to the clerical leadership.