Havelange Stadium will host the opening ceremonies of the 2016 Summer Olympics.
Buda Mendes/Getty Images

RIO DE JANEIRO (AP) -- The head of the public body coordinating planning for the 2016 Olympics in Rio de Janeiro has resigned, raising concerns about the city's ability to stage the first games in South America.

The resignation of Marcio Fortes, who headed the Olympic Public Authority was confirmed Wednesday by the organization. An APO spokesperson said Fortes had handed in his resignation to Brazil President Dilma Rousseff.

Fortes had complained that the office has lost its influence.

The resignation may concern inspectors from the International Olympic Committee, who will be in Rio at the end of the month to assess progress on preparations for the games. The IOC has expressed concerns that planning and construction are moving slowly.

Copyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

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