Here's the gist of USAT's
Perpetrators have dubbed the violent practice as the "knockout game," where teens try to randomly knock out strangers with one punch. The attacks have raised concerns across the country. In New Haven, Conn., police are investigating six incidents in the last month as part of "the knockout trend."
And the NYT's:
Police officials in several cities where such attacks have been reported said that the "game" amounted to little more than an urban myth, and that the attacks in question might be nothing more than the sort of random assaults that have always occurred. Police cautioned that they had yet to see evidence of an organized game spreading among teenagers online, though they have been reluctant to rule out the possibility.