ANGE ABOA  ONE person was killed and several injured when security forces opened fire on protesters in the southeast of Ivory coast yesterday, several witnesses said, a sign of spreading unrest ahead of an October 31 election boycotted by the opposition. More than a dozen people have been killed since August in protests against President Alassane Ouattara's plan to stand for a third term, which his opponents say violates the constitution. Images shared on social media showed protesters carrying a man through the streets of the town of Bonoua on a sheet of metal. "I saw the young man who…