A view shows the burned out Crocus City hall venue, the scene of Friday’s attack outside Moscow, on Saturday, March 23. Stringer/AFP/Getty ImagesISIS, also known as the Islamic State group, claimed responsibility for Friday’s deadly assault on a concert venue in Moscow, releasing graphic footage purporting to show its gunmen carrying out what was Russia’s worst terror attack in decades.Here’s what we know about the group: When was it formed?: ISIS-K was formed in 2015 and has been active in Afghanistan, Pakistan and Iran. It is a branch of ISIS, the terror group that emerged in…
March 25 Moscow concert hall attack
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