and he said wapow. >> a knockout attack killed this veet that meese man in st. louis. this surveillance video shows the suspects in a deadly new jersey attack walk away. in the midst of the intense media focus on these attacks, this new york city mother who asked us to disguise her face and voice now believes her 5-year-old son was a victim of the knockout game played by girls. >> he was a little shaken up. he was holding his head. and he said mom, i don't know. then he said, mom, i think those girls hit me in the head. >> the assaults are frightening. federal law enforcement officials say the incidents are isolated and they consider them a local police issue. >> with social media now, we're seeing more of this show up. has this been going on? this has been going on for years. but now sometimes i think the media is hyping it up more than anything else. and is there some maybe a copycat syndrome going on here? there could possibly well be. >> for the 11th hour, athena jones, cnn, washington. >> appreciate that, athena. we know this is is no game. it's assault. philadelp