U.S. Secretary of State John Kerry is in Brazil, where he is addressing concerns about Washington's controversial surveillance program.
New worries are circulating after Brazil's O Globo newspaper recently reported the U.S. National Security Agency included Colombia and Brazil in its tracking of telephone and Internet communications.
Kerry is speaking Tuesday with Brazilian Foreign Minister Antono Patriota and Brazilian President Dilma Rousseff. He visited Colombia on Monday.
In Bogota, Kerry said the United States is engaged in very complex efforts to stop terrorists from killing people in many different places. He said he is confident he was able to explain the legality of the spying and its intentions, and said the NSA program was a "very small" part of his talks in Colombia.
Colombian Foreign Minister Maria Angela Holguin told reporters she received what she calls the "necessary assurances" that allow Colombia and the U.S. to keep working together on the matter.
Kerry also pledged U.S. support for Colombia's efforts to negotiate an end to the 50 year-long battle with leftist FARC rebels.
Some information for this report was provided by AP.