A branch of the Islamic State group (IS), which once controlled vast swathes of Iraq and Syria, has claimed responsibility for the deadly terror attack at a Moscow concert hall which took place on Friday. At least 93 people were killed and over 145 injured when as many as five gunmen, armed with automatic weapons, entered the Crocus City Hall and opened fire on concertgoers, who were there to see the popular Soviet-era rock band Picnic. Hours after the attack, the Islamic State Khorasan Province, known as ISKP or ISIS-K, the Afghan affiliate of ISIS, claimed responsibility for the attack throu…