Haiti ? Two FBI hostage negotiators were sent to Haiti on Tuesday to help secure the release of a kidnapped American missionary, officials said.

Nathan Jean-Dieubonne, 58, a U.S. citizen of Haitian descent, was abducted Sunday afternoon as he and three others drove home from church in Croix-de-Bouquets, a suburb of Port-au-Prince, U.N. police spokesman Fred Blaise said.

FBI special agent Judy Orihuela said from Miami that Jean-Dieudonne’s family requested help in negotiating with his captors after the kidnappers contacted them and demanded a ransom for his release. Authorities have declined to say how much the kidnappers sought.

U.N. police spokesman Fred Blaise said Jean-Dieudonne, whose hometown in the U.S. and church denomination were not immediately available, apparently was unharmed and that his family described him as being “in good spirits.”