Justin Bieber -- Rowdy Fans Cause Chaos, Destruction

Justin Bieber -- the cause of mas destruction all across South America!

TMZ has photos of rowdy fans in Argentina ... destroying barricades outside his hotel in Buenos Aires.

Bieber and his entourage arrived about 4am this morning at the Hotel Faena ... where a group of out-of-control teenagers tore down wooden walls erected for crowd control.

Pics show the Biebs outside the hotel -- pants sagging -- being questioned by an officer in a patrol car ... but there's no indication Justin or his boys had anything to do with the vandalism.

Bieber is touring through several South American countries. He left Brazil yesterday ... just hours before police there decided to charge him for defacing property by spray-painting graffiti on a building in Rio de Janeiro.