Sao Paulo, Brazil (CNN) -- Brazil and Mexico summoned U.S. ambassadors Monday after media reports that the United States had spied on their countries' presidents. "Without prejudging the veracity of the information presented in the media, the Mexican government rejects and categorically condemns any espionage work against Mexican citizens in violation of international law," Mexico's foreign ministry said in a statement. In Brazil, Foreign Minister Luiz Alberto Figueiredo called the situation "an inadmissible and unacceptable violation of Brazilian sovereignty." The statements were the latest sign of international fallout over documents leaked by former National Security Agency contractor Edward Snowden.
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NEW: Brazil's foreign minister decries an "unacceptable violation" of the country's sovereignty
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Mexico summons the U.S. ambassador to demand an investigation
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Journalist Glenn Greenwald tells Brazil's Globo TV about NSA documents
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He says one document is on Mexico's soon-to-be president discussing his Cabinet picks
A @placeholder news report Sunday described the alleged espionage, citing Glenn Greenwald, a Brazil-based journalist who obtained documents from Snowden.