Escalation in Brazil US espionage row
18 September 2013 Last updated at 01:49 BST
Brazilian President Dilma Rousseff has called off a state visit to Washington next month in a row over allegations of US espionage.
The US National Security Agency (NSA) has been accused of intercepting emails and messages from Ms Rousseff, her aides and state oil company Petrobras.
Wyre Davies reports.