PORT-AU-PRINCE (AFP) - At least one person was killed and several wounded when gunmen opened fire on a rally for presidential candidate Michel Martelly, his spokeswoman said Saturday. The UN police force in Haiti confirmed the incident in the town of Les Cayes, in southern Haiti, but was unable to give a number of victims. UN police were not involved, said spokesman Jean-Francois Bezina. Martelly spokeswoman Karine Beauvoir described the late Friday attack as an attempt on the candidates life. Martelly, a popular singer widely known as Sweet Micky, is one of the leading candidates in Sundays presidential vote. Martelly was in the street with his supporters, said Beauvoir. There was an ambush. They fired on the crowd with automatic weapons. Martelly supporters blamed members of the ruling INITE party for the attack. We recognized some of the armed men and they are from INITE, Beauvoir charged. There was no immediate confirmation of her allegation. The INITE candidate is Jude Celestin, an engineer supported by President Rene Preval. Celestin, Martelly and former first lady Mirlande Manigat are among the front runners of 18 candidates in the Sunday vote. In earlier electoral violence, two people were shot dead late Monday in Beaumont, a small town in southwestern Haiti, when supporters of Celestin and candidate Charles Henri Baker squared off armed with firearms, rocks and bottles. Haiti, already ravaged by a catastrophic earthquake in January, is also battling a spiraling cholera epidemic that has killed more than 1,600 people. Nearly 4.7 million Haitians are eligible to vote in Sundays elections, which will also see 11 of the countrys 30 senators and all 99 parliamentary deputies chosen. Haitis next president faces the daunting task of rebuilding a traumatized nation of 10 million that was already the poorest in the Americas before the