No, I'm pretty sure it did not happen that way. I don't even think they were at the location of the party. It was a couple blocks away.
The local news stations in Atlanta metro each have been showing the video of the several pickup trucks with the multiple flags waving while passing in front of the birthday party address as the partygoers and even police are there observing and reacting. The video was either made by the partygoers or the news media as they had been alerted. The culprits were definitely there onsight. Re-check with your friends/neighbors. Thanks.