It's probably an organized terrorist group, maybe Isis but this would be a bold attack for Isis.
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People that support ISIS are cheering on their social media in arabic. [spoiler]I don't get why their social media hasn't been taken down…[/spoiler]
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Something should have been done about Isis a long time ago... I can see this happening again in the near future once this incident has died down.
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Being able to watch terrorist chatter is better than shutting it down only to have it pop up somewhere new.
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Given the bombings in Beirut I would bet it's ISIS or their allies.