Harrowing footage has now emerged of the moment the terrorists began firing inside the venue - cutting out the band's performance and prompting members to flee.
ISIS has now claimed responsibility, saying 'eight brothers wearing explosive belts and carrying assault rifles' conducted a 'blessed attack on... Crusader France'.
The killers - who are understood to have been young, with one possibly just 15 - specifically targeted places where young people were enjoying their Friday evening.
Those fortunate enough to escape the massacre later described scenes of chaos as Kalashnikov-wielding gunmen told people trying to flee, 'if you move, we'll kill you'. The jihadists paused briefly to move up to the balcony, where they reloaded and opened fire at concert-goers in the pit downstairs.
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