Rio de Janeiro: Just 50 days before Brazil hosts the World Cup, authorities beefed up security Wednesday in Rio de Janeiro after a violent clash between residents and police in a slum near the tourist haven of Copacabana beach.

Dozens of military police, including members of a feared special forces battalion, moved into the Pavao-Pavaozinho slum, which is also near the well-heeled Ipanema district, an AFP journalist reported.