Iran said the five nationals involved in the twin attacks in Tehran were Islamic State members who had been to the group's strongholds in Iraq and Syria

Iran says Teheran attackers had been in Iraq, Syria for IS

The Islamic State group has claimed responsibility for the attacks

Iran twin attacks: 13 killed, Iran Guards claim US, Saudi 'involved'

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iran twin-attacks

Iran says Teheran attackers had been in Iraq, Syria for IS

Iran twin attacks: 13 killed, Iran Guards claim US, Saudi 'involved'