According to the guests, Bieber grabbed a drugged-up man and held him up against a wall after spotting him grabbing a woman by the throat, reports tmz.com.
The "Baby" singer was at the party with a friend on April 14 when the unnamed attacked, who appeared to be on drugs, attacked a woman.
Security then forced the guy out of the party. He was later arrested, according to outlet, for causing a scene outside the bash as he started chasing an SUV he believed was Bieber's.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)