Eleven L.A. County Sheriff's patrol cars descended on Justin Bieber's house a few minutes ago and they are executing a search warrant in connection with the egg-throwing incident ... law enforcement sources tell TMZ.
Sources tell us ... deputies are looking for any evidence that links Bieber to the egg assault on his next door neighbor.
We're told this is a FELONY search warrant -- meaning Justin is under a microscope for a crime that could land him in prison.
