People hold pictures at the funeral of victims of the attacks on the Iranian parliament and Ayatollah Khomeini's mausoleum in Tehran, June 2017.
Reuters

After three years of trying to strike Iran, the Islamic State (ISIS) finally succeeded in June. The group attacked two highly symbolic and secure targets near Tehran: the Iranian parliament and the mausoleum of Ayatollah Ruhollah Khomeini, the founder of the Islamic Republic. With this attack, ISIS ticks off its list another important target.

In the summer of 2014, Iranians were panicking as ISIS gained ground in Iraq and its leader declared a caliphate. Iran has grappled with terrorism since the 1940s, but ISIS was a new breed. It controlled swaths of territory not far from Iran’s porous border with

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