LOS ANGELES: Detectives searching pop singer Justin Bieber’s Los Angeles mansion over an egg-throwing attack seized illegal drugs and arrested one of the singer’s associates on Tuesday, officials said.

Los Angeles Sheriff’s Department officer Dave Thompson said an individual was arrested after the drugs were discovered in “plain view” as deputies combed through Bieber’s luxury home in the upmarket enclave of Calabasas.

Around a dozen detectives swooped on the 19-year-old star’s home early Tuesday, probing allegations that the Canadian teen idol was responsible for causing thousands of dollars in damage to a neighbor’s house after pelting it with eggs. Thompson said an investigation into a “felony crime” was ongoing, with the neighbor claiming as much as $20,000 in damage was caused.

On the narcotics arrest, he initially said the drug found on the premises was cocaine, but his department later backtracked on that statement.

“Nothing is confirmed,” another spokeswoman for the sheriff’s department, Sergeant Carmen Arballo, told AFP.

“It’s a controlled substance but we don’t know if it’s cocaine. We won’t know until it’s gone to a lab and been tested.” Another sheriff’s spokesman told The Los Angeles Times it could be a form of ecstasy.

Thompson said the drugs found at Bieber’s property were “in plain view of the deputies when they were looking for the evidence.”