Iran's revolutionary guards blame US, Saudi for Tehran attacks

Iran's Revolutionary Guards on Wednesday said the US and Saudi Arabia were "involved" in deadly twin attacks in Tehran which killed at least 12 people.

Vowing revenge for the coordinated attacks on Iran's parliament and the shrine of Ayatollah Khomeini, the revolutionary guards said they would "never allow the blood of innocents to be spilt without revenge."

"This terrorist action, coming one week after the meeting of the president of the United States with the leader of the one of the region's reactionary governments (Saudi Arabia)... shows they are involved in this savage action," a statement said.

The deputy chief of the Guards' Intelligence Service, Mohammad Hossein Nejat, said the attackers were aged between 20 and 25 and spoke Arabic, although their nationality was not yet known.

"The US and Saudi regime had ordered their stooges to do this," he told the Fars news agency.

Saudi Arabia's Foreign Minister Adel Al-Jubeir rejected the accusation by Iran's Revolutionary Guards, saying there is no evidence that Saudi Arabia was behind the attack and he did not know who was responsible.

Speaking in Berlin, he said he condemns terrorist attacks wherever they occurred.

Iran's President Hassan Rouhani, meanwhile, called for "regional and international cooperation and unity" following the deadly assaults, saying Iran would "break any plots and machinations by ill-wishers with more unity and integrity and its powerful security structure."

The Islamic State group claimed responsibility for the attacks through its Amaq news agency, the first attack by the extremist group inside Iran.