1:17 PM PT -- Plano PD tells TMZ ... witnesses say this group of guys was selling chocolate in the Hooters parking lot, and when they were approached by a manager and asked to leave -- things allegedly got violent. We're told a couple of them attacked the manager and left with him a broken arm, and at that point ... things spilled inside, where a customer was hurt too.
PPD says they're investigating this as an aggravated assault case ... but so far, no arrests have been made. They'll be looking at this video as part of the evidence.
A Hooters in Texas came under intense assault this week -- with a group of youths going crazy on the establishment and their customers ... supposedly, because of some candy.
Video from the altercation first surfaced on Thursday -- when the incident appears to have happened -- but started making the rounds this weekend ... and the footage is absolutely wild. You see a bunch of young guys, some of whom are shirtless, losing their minds.
They're beating up what appear to be patrons in the vestibule of the restaurant ... wailing on one guy in particular who falls to his knees. Some of the employees -- including at least one Hooters girl -- also seem to get roped into the action ... with complete chaos unfolding.
One person filming says something to the effect of ... "all over chocolate," and you even see a chocolate bar on the ground at one point. Welp, as it turns out -- that's exactly what allegedly sparked this whole thing ... according to a Hooters manager who spoke to TMZ.
We're told these guys are door-to-door salesmen and that they came around that night trying to hawk their goods, only to be turned away over a no-soliciting policy Hooters has -- which is apparently what set them off.
There weren't more details provided, but the Hooters manager says they've resumed business and that a criminal investigation is ongoing.
We've reached out to the local authorities, including Plano PD, to see if anything further came from this ... so far, no word back.