National Security Archive that a 1991 document from the U.S. Defense Intelligence Agency had described then-Senator Uribe as a "close personal friend" and collaborator of Pablo Escobar. The Uribe administration denied several of the allegations in the 1991 report. Starting in 2004 a disarmament process was begun of Colombia's paramilitary groups (especially the AUC) and was completed on April 12, 2006, when 1,700 fighters turned in their weapons in the town of Casibare. In May 2006, the Colombian presidential election resulted in Uribe winning re-election with a historic first round vote tally of 62%, followed by leftist Carlos Gaviria with 22% and Horacio Serpa. 2007–2009 On June 28, 2007, the FARC suddenly reported the death of 11 of the 12 kidnapped provincial deputies from Valle del Cauca Department. The Colombian government accused the FARC of executing the hostages and stated that government forces had not made any rescue attempts. FARC claimed that the deaths occurred during a crossfire, after an attack to one of its camps by an "unidentified military group". FARC did not report any other casualties on either side. In 2007, Venezuelan President Hugo Chávez and Colombian Senator Piedad Córdoba were acting as authorised mediators in the ongoing humanitarian exchange between the FARC and the government of Colombia. Colombian President Álvaro Uribe had given Chávez permission to mediate, under the conditions that all meetings with the FARC would take place in Venezuela and that Chávez would not contact members of the Colombian military directly, but instead go through proper diplomatic channels. However, President Uribe abruptly terminated Chávez's mediation efforts on November 22, 2007, after Chávez personally contacted General Mario Montoya Uribe, the Commander of the Colombian National Army. In response, Chávez said that he was still willing to mediate, but had withdrawn Venezuela's ambassador to Colombia and placed Colombian-Venezuelan relations "in a freezer" President Uribe responded by accusing Chávez of legitimizing terrorism and pursuing an expansionist project on the continent. Several scandals have affected Uribe's administration. The Colombian parapolitics scandal expanded during his second term, involving numerous members of the administration's ruling coalition. Many pro-government lawmakers, such as the President's cousin Mario Uribe, have been investigated for their possible ties to paramilitary organizations. At the end of 2007, FARC agreed to release former senator Consuelo González, politician Clara Rojas and her son Emmanuel, born in captivity after a relationship with one of her captors. Operation Emmanuel was proposed