Colombian conflict dialogue, but President Barco sent an ultimatum to the guerrillas and demanded that they immediately disarm or face military retaliation. Regional guerrilla and Army skirmishes created a situation where each violation of the ceasefire rendered it null in each location, until it was rendered practically nonexistent. By 1990, at least 2,500 members of the FARC-founded Patriotic Union had been murdered, according to historian Daniel Pecáut, leading up to that year's assassination of presidential candidate Bernardo Jaramillo Ossa. The Colombian government initially blamed drug lord Pablo Escobar for the murder but journalist Steven Dudley argues that many in the UP pointed
Mario Uribe Escobar the Supreme Court of Colombia found enough merits and evidence to issue an arrest warrant against Uribe-Escobar without a right to pay a fine. Uribe-Escobar was syndicated of "concert to commit crimes" consisting on agreeing to promote illegal armed groups. He had been accused by the Supreme Court but since Uribe-Escobar had renounced from his post as senator, ordinary justice could put him on trial. After receiving the notification Uribe-Escobar announced to the Colombian authorities that he was going to surrender voluntarily and comply with the mandate of the Attorney General of Colombia. Uribe was set free of prison on