ISIS are unsurprisingly reported to be behind the attacks:
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Is the Islamic State behind the attack? Right now it’s not officially confirmed. However, Terrorism Research & Analysis Consortium reports that ISIS terrorist accounts are posting about it.
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A tweet sent out by an ISIS-supporting Twitter account links the Nice attack as retaliation for the death of Abu Omar al-Shishani, a Georgian Chechen commander of the Islamic State that ISIS recently admitted had been killed, reports The Telegraph.