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While Conor McGregor wasn't set to compete in Saturday night's UFC 223, the lightweight champion showed up Thursday outside a pre-fight media event at the Barclays Center in Brooklyn, New York.

According to Mark La Monica of Newsday Sports, he is facing four criminal charges from the New York Police Department after throwing a dolly through the window of a bus carrying UFC fighters: three misdemeanor counts of assault and one felony count of criminal mischief:

Longtime McGregor teammate and training partner Artem Lobov, who was set to compete on the UFC 223 undercard, told RT.com in February that it was possible the Irishman would be in his corner.

According to MMA Fighting's Ariel Helwani, McGregor crashed the media day as retaliation for a dust-up between Lobov and a group led by the event's headliner, Khabib Nurmagomedov.

There was also speculation McGregor was upset about UFC President Dana White's announcement Wednesday that the Irishman would be stripped of his lightweight title, with the winner of Nurmagomedov vs. Max Holloway (before Holloway was declared medically unfit) set to take the belt.

McGregor and his crew were in the parking area, where Nurmagomedov and his manager were about to depart on a bus alongside several other fighters and members of the UFC staff. Words were exchanged, which was followed by McGregor hurling a hand truck through one of the bus' windows. Someone else also threw an object and cracked the windshield.

Video contains profanity.

The fracas resulted in the cancellation of three UFC 223 fights. Ray Borg and Michael Chiesa both suffered injuries due to the broken glass, while Lobov was pulled due to his involvement. McGregor surrendered to police a few hours later. According to SiriusXM's Michael Stets, his arraignment will take place at Brooklyn Criminal Court.

It is unclear as of this writing what punishments McGregor could face from the state of New York, the New York Athletic Commission or the UFC.