TMZ Sports has obtained video of Conor McGregor and his entourage going BERSERK at the Barclays Center ... attacking a bus leaving the arena with several UFC fighters including Khabib Nurmagomedov.
An object was thrown through one of the bus windows -- and the damage left one fighter, UFC lightweight contender Michael Chiesa, cut up and bloodied.
Unclear who was responsible for shattering the side window but it's clear people on the bus suspect it's Conor.
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