sentences:  On April 23, 2008 President Uribe revealed that a former paramilitary fighter had accused him of helping to plan a 1997 massacre, a charge which he said was under official investigation.Uribe described the accuser as a "disgruntled convict with an axe to grind", denied the charges and said there was proof of his innocence.The Colombian newsweekly Revista Semana reported that the paramilitary in question, Francisco Enrique Villalba Hernández, had not mentioned Uribe during previous declarations made more than five years ago, when he was sentenced for his own role in the massacre.