Rapper Lil Za has been arrested for narcotics possession following a police search at Justin Bieber's house.

Cops attended the singer's house in Los Angeles on Tuesday (January 14) with a search warrant to investigate claims he caused more than $20,000 in damages after egging a neighbour's home.

However, his friend Lil Za was led away in handcuffs after police found what they believe could be cocaine or a form of ecstasy in Bieber's house.

The find is not connected with the 19-year-old Canadian and Bieber hasn't been arrested.

Steve Whitmore from Los Angeles County Sheriff's Office said: "There were about eight people at the residence, they were detained. Justin Bieber was there as well. He was also detained, not arrested. The alleged narcotics were in such a location that they were directly related to one person and not related to the house at large."

He added that Lil Za was arrested again for damaging a phone in his holding cell and that the rapper has now been released on bail.

Speaking meanwhile about Bieber's alleged egg attack, Whitmore said: "It's a felony crime; I get that it was done with eggs, which makes you feel that it's a lower-level crime, but a felony crime is a felony crime, no matter how you commit it. And this crime rose to the felony section, and a judge signed a search warrant saying we should go get evidence related to the felony crime."