WDB BODY IN FOREIGN AIRSPACE HAS TFC CONFLICT WITH MLG.

Narrative

THE FLT ORIGINATED IN MIAMI WITH A DEST OF BUENOS AIRES; ARGENTINA. THE FLT WAS PROCEEDING ALONG VA301. AT WAYPOINT BOLAR WE REQUESTED AND RECEIVED CLRNC TO CLB FROM FL290 TO FL330 FROM BARRAN QUILLA CTL WE CALLED REACHING FL330. AT THE NEXT RPTING POINT (OVERHEAD BA NDB) WE MADE THE STANDARD POS RPT FL330. APPROX 90 NM S OF BA NDB OUR TCASII ISSUED 'TFC.' A VISUAL TARGET WAS ACQUIRED AT OUR 2:30 O'CLOCK POS AND AT OUR ALT. THE SUN WAS LOW IN THE W AND IT WAS DIFFICULT TO DETERMINE EXACTLY WHAT THE OTHER ACFT'S FLT WAS AT FIRST; BUT THE OTHER WAS ON A W TO E TRACK PROBABLY ON VA553 PASSING FROM OUR R TO L. THE OTHER ACFT; A B-737 OF UNKNOWN REGISTRY; BEGAN TO DSND AND TURN TO THE N BEHIND US. WHEN THE OTHER ACFT PASSED US HE WAS 1500 FT BELOW US AND APPROX 1 MI BEHIND US. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT THERE WAS A GREAT DEAL OF CONVERSATION IN SPANISH WITH THE OTHER ACFT AND ATC. IF IT HAD BEEN IN ENGLISH HE MIGHT HAVE HAD SOME IDEA WHO THE OTHER ACFT WAS; WHERE HE WAS AND WHAT HE WAS DOING. WHEN THINGS SETTLED ENOUGH TO MAKE A CALL TO QUERY THE CTLR; RPTR'S ACFT WAS OUT OF RANGE. HE BELIEVES IT MAY HAVE BEEN A CTLR ERROR.