UPDATE: UFC President Dana White says 3 members of Khabib's team were taken out of the arena in handcuffs, however a short while later they were released because Conor refused to press charges.
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A great night of MMA fights were marred by probably the ugliest moment in UFC history at UFC 229 tonight/this morning.
Khabib Nurmagomedov defeated Conor McGregor in dominating fashion to retain the lightweight belt. But after securing the win (via rear-naked choke at 3:03 in the 4th round), Khabib hopped out of the Octagon, and went after Dillon Danis, one of McGregor's training partners.
While that was going on, it appears members of Khabib's camp entered the Octagon and started attacking Conor. Pay attention to the 25 second mark of the video below when someone in a red shirt jumps in and blindsides Conor, all the while one of Khabib's cornermen punched Conor from the front.
Another angle from right behind where Khabib leaped from the raised area outside the Octagon.