Attack comes amid escalating tensions over Qatar, Syria.
BLOOMBERG.COM

The perpetrators of the twin attacks in Tehran were recruited inside Iran by the Islamic State militant group and had fought in both Iraq and Syria, the country’s intelligence ministry said on Thursday. The five “had ties to Wahhabi groups,” the ministry said in a statement published by Fars news agency, referring to the austere form of Islam practiced in Saudi Arabia. After being attracted by Islamic State they left Iran and “took part in operations in Mosul and Raqqa,” according to the statement, which withheld the attackers’ names citing security reasons.

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