The Islamic State of Iraq and the Levant (ISIL, also known as ISIS) group claimed responsibility and released a video purporting to show gunmen inside the parliament building.
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The Iranian elite force vowed in a statement on Wednesday to seek revenge.
“The fact that Islamic State has claimed responsibility proves that they were involved in the brutal attack,” referring to Saudi Arabia.
The statement also said that the “spilled blood of the innocent will not remain unavenged”.
Saudi Minister of Foreign Affairs Adel al-Jubeir, speaking in the German capital of Berlin, said he did not know who was responsible and there was no evidence Saudi nationals were involved.
Ghanbar Naderi, a journalist from Kayhan International, told al Jazeera from Tehran that “people don’t believe that ISIS is acting alone”.
“They have patrons, they have associates in the Middle East and beyond. Saudi Arabia is one of the main suspects because of its ideology that goes well with what the ISIS fighters feel, think and believe,” he said.