RIO DE JANEIRO (AP) — Brazil's tourism minister said Thursday the visa requirements may be lifted for Americans wishing to attend next year's Rio de Janeiro Olympics, an effort that may boost ticket sales. Rio Olympic organizers say they are satisfied with the early ticket demand, though some estimates show demand at this stage lagging well behind the 2012 London Olympics. Ticket sales to Brazilians appear to be strong for events like soccer, basketball, volleyball and track and field, but weaker for Olympic events that are not widely followed in the South American country. "Brazil has chronic difficulties, we know that," Alves said, listing security and public services.