Do you have any photos of these bees? I'm no expert, but other than Africanized bees, I haven't heard of such aggressive gatherings. There's a Beekeeping forum on this site, they might know more about this.
I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit Nature and more time tasting her sweetness and respecting her seniority. E. B.White
Integrity can never be taken. It can only be given, and I wasn't going to give it up to these people. Gary Mowad