Mayor Patricia Arce Guzmán was covered in red paint before angry demonstrators surrounded her and cut her hair, saying they were angry over three recent deaths.
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Patricia Arce, the female mayor of a little town called Vinto located in Bolivia was aggressively attacked by protesting citizens.
Luis Fernando Camacho, a civic leader from the eastern city of Santa Cruz, appeared at rallies in the city on Thursday, calling for Morales to step down.
Mayor Arce belongs to the Movement to Socialism (MAS) party - the same party as President Morales.
Frightful images of the mayor show her covered in red paint, her hair cut, and her body covered in dirt.
Masked protesters called Arce a murderer and dragged her for almost five kilometres before they cut off her hair and doused her with paint, local newspaper Los Tiempos reports.
It's believed the group heard rumours two opposition protesters had been killed in nearby clashes between anti-government protesters, and supporters of the Bolivian president, Evo Morales, prompting them to march to the city centre. The government also slammed "shameful" violence that led to scores being injured and one killed on Wednesday, blaming the clashes on the opposition as anger rose on both sides. Protesters, however, managed to set her office on fire and smashed the town hall's windows.
In La Paz, anti-Morales protesters taunted the president by offering a letter of resignation and promised to continue their action until he leaves government. She said that she will not stop talking regardless of the risk of losing her life. Speaking at a naval ceremony on Wednesday, Morales said that the military must "serve the people" and support the government.
The European Union and the United Nations expressed concern about the vote, but Morales rejected a request by the Organization of American States for the vote to go to a second round because of the concerns.
Government critics, however, pointed the finger at supporters of Morales. If he wins the election he'll stay on as president for another five years. Suspicions about possible electoral fraud arose following a 24-hour halt in the reporting of vote results.