President Luiz Inacio Lula da Silva of Brazil and Michelle Bachelet of Chile said in Sao Paulo they would put the issue before an August 10 meeting of a nascent South American Defence Council in Ecuador.
Spain's foreign minister, Miguel Angel Moratinos, and his Brazilian counterpart, Celso Amorim, simultaneously told reporters in Brasilia that they would demand explanations from Washington over the bases.
The Colombian government's announcement July 15 that three of its military air bases were to be used by the United States as part of joint anti-drug operations has ignited concerns and anger among Colombia's neighbours.
