BRASILIA, Brazil (Reuters) -- Intelligence chiefs from six South American
                  countries broke from a secretive huddle in Brazil's capital after swapping notes on
                  possible fallout from Colombia's offensive on drug traffickers and Marxist rebels.

                  The closed-door talks on Thursday at the headquarters of Brazil's National Intelligence
                  Agency ended with a short statement saying Colombia and its five neighboring nations had
                  resolved to "perfect the exchange of intelligence."

                  Brazil's Gen. Alberto Cardoso, the president's chief security adviser and the meeting's host, declined to
                  comment further.

                  The meeting comes as Colombia's five neighbors -- Brazil, Peru, Ecuador, Venezuela and Panama,
                  all represented in Brasilia -- move to reinforce their common borders with the war-torn nation.

                  They worry that "Plan Colombia," the country's U.S.-backed, $7.5 billion assault on the drug trade
                  in rebel strongholds, could push the conflict over its border into their territories.