TMZ exclusively reports that cops are looking for clues to determine if he was the one who pelted his neighbor's house with about 20 eggs, causing about $20,000 worth of damage.

If they find anything illegal in his house during the felony search warrant, then the police can rack up more felony charges against Justin.

RUN, Justin! RUN!!

Update: 8:42am

Justin Bieber is being detained in his garage while police search his home. They are also looking for surveillance video which may indicate Justin was behind the felony criminal property damage.