Ingrid Betancourt videotape
It is the first indication in more than a year that Ms Betancourt is still alive.
She was last seen in a previous video released in July 2002.
The guerrillas, from the Revolutionary Armed Forces of Colombia (FARC), want a number of rebel prisoners released in exchange for Ms Betancourt.
There is no clue as to when the tape was made, although in it Ms Betancourt refers to an incident on 5 May 2003.
BBCNews 31 August, 2003