4:38 PM PT -- An attorney repping the Monster Mania Convention organizers in this matter tells TMZ ... "Our client, Monster-Mania LLC, is assisting authorities in their investigation into an alleged incident involving an attendee and a celebrity guest at its convention in Cherry Hill, New Jersey last weekend. Immediately upon receiving a complaint from the attendee, the celebrity guest was removed from the convention and instructed not to return. Monster-Mania also encouraged the attendees to contact the police to file a report."
They add, "The safety and well-being of all our attendees is of the utmost importance to Monster-Mania, and the company will not tolerate any behavior that could compromise those values. Monster-Mania will continue to assist the authorities in any and every way possible."
Gary Busey is facing criminal charges out of New Jersey after cops claim he made inappropriate contact with people, among other things.
The actor was hit with four charges Friday by the Cherry Hill Police Department -- two counts of criminal sexual contact, one count of criminal attempt/criminal sexual contact and one count of harassment.
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Cops say this stems from a report of a sex offense during the weekend of August 12-14 at the Doubletree Hotel. They describe more than one incident that people reported during the Monster Mania Convention -- for which he was booked to appear -- but the details of any alleged acts are unclear at this point. CHPD didn't go into detail about what was reported.
There's no doubt Gary was in attendance for this thing BTW -- he took multiple photos with fans throughout the three days. Just check his tagged section on IG, and you'll see 'em all.
Unclear if Busey is still in town or not, or what the process will look like to have to answer for these charges in Jersey if he has, in fact, left the state. He, of course, lives in California ... and it doesn't sound like he was arrested there on the spot last week.
We've reached out to Gary's reps ... so far, no word back. TMZ has also reached out to Cherry Hill PD for more info on what this is all about -- but they haven't responded yet.