Felipe Dana, Associated Press
Rio de Janeiro Mayor Eduardo Paes, left, and Brazilian Sports Minister Ricardo Leyser, take part in the inauguration of the renovated Marina da Gloria in Rio de Janeiro, Brazil, Thursday, April 7, 2016. The revamped marina on the Guanabara Bay is to be the starting point of the 2016 Summer Olympic sailing competition.

RIO DE JANEIRO — Rio de Janeiro Mayor Eduardo Paes says the city's preparations for the South America's first Olympics have not been touched by the spreading corruption scandal that is gripping Brazil.

Paes was asked on Thursday about possible graft and said, "There are no charges against the city hall. I know everyone is crazy to find (some) but there is nothing."

Paes has been a key organizer of the Olympics that open in four months, but faces pressure over construction contracts linked to games projects.

Several construction companies behind Olympic projects are also embroiled in the massive bribery scheme at the state-run oil company Petrobras that is shaking the country.

A graft scandal would add to Rio's Olympic woes, which include water pollution, the mosquito-borne Zika virus, and $500 million in budget cuts.