selling market. Gangs rule in most of Rio's slums and warfare often spills out in the streets, even closing main thoroughfares. Hordes of tourists are arriving in Rio for Saturday's free Rolling Stones gig and for the Feb. 24 start of Carnival. Police will occupy slums around Copacabana beach, where band will play, and reinforce patrols across the city. --SP 23 07 Local Time 20 07 GMT