(TMZ) - 8:26 AM PT -- TMZ reports deputies are detaining Justin in his garage right now while they search.  TMZ is told they are also looking for surveillance video from Justin's house that might capture the egging incident.


Eleven L.A. County Sheriff's patrol cars descended on Justin Bieber's house earlier today and they are executing a search warrant in connection with the egg-throwing incident ... law enforcement sources tell TMZ.

Sources tell TMZ ... deputies are looking for any evidence that links Bieber to the egg assault on his next door neighbor.

TMZ reports this is a FELONY search warrant -- meaning Justin is under a microscope for a crime that could land him in prison.

Sources tell TMZ cops will look for anything that is relevant to the egg incident, including other eggs in the house and possible video.  Sheriff's deputies have looked at TMZ's video of the incident and want to see if someone inside Justin's house videotaped the incident as well.

By the way ... looking for other eggs may sound silly, but it isn't.  There could be some sort of identifier that links what's in Justin's fridge to the broken eggs outside.

Here's the thing ... If in the course of the search cops find something illegal -- like drugs -- it's fair game.

TMZ reports there's a battering ram at the scene.

Photo Credit Splash News