Because ISIS doesn’t see Iran as part of the arab world. They’re seen as persians. Not arabians. ISIS and Iran have been feuding for a long time. They recently bombed iran and killed 84 people. Also, reuters is now reporting the missles hit more than 40 kilometers from the US consulate. Lol, twitter claims another.
ISIS considers the Shia branch of Islam to be heretical and has targeted shrines and religious sites in Iran previously.
ISIS has claimed responsibility for the deadly twin blasts near the burial site of slain military commander Qasem Soleimani in southern Iran.
amp.cnn.com