The convoy of a leading Haitian presidential candidate came under attack from gunmen, the candidate's sister said Tuesday.

"We just cannot believe it. It's unbelievable. We're still in shock," said Rita Celestin-Rancy, a sister of Jude Celestin, who was traveling with her brother's 20-vehicle convoy to the southern city of Jeremie when they came under fire near Beaumont.

Celestin-Rancy said one person was killed and another wounded. Police did not return calls from CNN.

Campaign manager Joseph Flambert called into Haiti's Radio Caraibes to say the convoy retreated after a "hail of bullets."