One teenager is in custody and another remains on the loose in connection with knockout-game attack that only surfaced online. Paterson Police became aware of the Dec. 7 attack after a video was posted to Facebook. The video shows a teen punching an elderly man who was getting ready to cross Rosa Parks Boulevard from Van Houten Street. After an investigation, the assailant has been identified and petitions have been signed against him for aggravated assault and endangering an injured victim. He is being sought by police. A second juvenile filmed the assault and is heard encouraging the aggressor. He has also been identified and is charged with aggravated assault and endangering an injured victim. This teen turned himself in to the Paterson Police Department on Saturday. Both teens live in Paterson.