Detectives searching pop singer Justin Bieber's Los Angeles mansion over an egg-throwing attack seized cocaine and arrested one of the singer's associates on Tuesday (14 Jan), officials said.

Around a dozen detectives swooped on the Bieb's, and cocaine was found "in plain view of the deputies when they were looking for the evidence." Bieber was home but wasn't arrested.

He added that the pop star was "not connected to that cocaine other than the gentleman was staying at his residence."

The Los Angeles Sheriff's Department earlier confirmed they had served a warrant at Bieber's home over the egg-throwing allegations.

"The purpose of the search warrant is to seek video surveillance or other possible evidence in the vandalism that occurred on January 9 ... The vandalism damage is estimated by the homeowner to be approximately $20 000," a statement said.

The warrant followed a complaint from a neighbour of Bieber that the star had hurled raw eggs at his home last week.

Is Bieber taking his antics too far now?

Update: The LA County Sheriff’s Department now says they believe the drug to be a form of ecstasy, not cocaine.