Students wearing costumes face riot police as hundreds of teachers and students march during a protest in Medellin, Colombia, Sept. 5, 2012. Demonstrators were demanding better pay conditions and rejected the privatization of education.

Protesters spit fire during a march by teachers and students in Bogota, Colombia, Sept. 5.

A riot police officer, with a helmet stained by thrown paint, watches a march of teachers and students protesting a wide range of issues regarding the government's educational policies in Bogota, Colombia, Sept. 5.

Teachers and students shout slogans during a protest against the Colombian National Education Ministry in Cali, Colombia, Sept. 5.

Colombian army members throw tear gas canisters toward a group of indigenous at the Alto de Berlin hill in Toribio on July 18.

Indigenous stand clear of tear gas thrown by Colombian army forces from the Alto de Berlin hill in Toribio, Colombia, on July 18.

Colombian army members examine indigenous on the Alto de Berlin hill in Toribio, on July 18.

Nasa Indians charge a soldier in Toribio, southern Colombia on July 17. Dozens of Indians attacked half a dozen soldiers guarding communication towers on the outskirts of the town.

Indigenous natives drag Colombian army sergeant Rodrigo Garcia out of his military post on Mount Berlin in Toribioon July 17, 2012.

Nasa Indians drag off a soldier in Toribio, southern Colombia on July 17.

A soldier tries to stop another from shooting in the air.

A soldier is attacked by indigenous trying to evict them from a military control base in El Alto del Berlin mountain in Toribio, Cauca, Colombia

Army sergeant Rodrigo Garcia leaves with tears in his eyes after he was forced out of his military post on Mount Berlin on July 17, 2012.

Revellers play with tomato pulp during the annual "Tomatina" (tomato fight) in Sutamarchan Province.

Revellers play with tomato pulp during the annual "Tomatina" (tomato fight) in Sutamarchan Province in Boyaca on Sunday.

Revellers play with tomato pulp during the annual "Tomatina."

Firefighters spray water on people at the end of the sixth annual tomato fight festival called "tomatina" in Sutamarchan.

An aerial view shows a clandestine airstrip used for drug smuggling after it was destroyed in a military operation, approximately 22 miles from the border with Colombia, in the state of Apure on Thursday.

A clandestine airstrip used for drug smuggling is destroyed.

Venezuelan Interior Minister Tarek El aissami (C) watches the debris of an aircraft during an operation to destroy clandestine airstrip used by drug traffickers in Apure on Thursday. In the frame of the operation "Boquete" (Hole) launched May 26, two presumed traffickers were arrested and 36 clandestine airstrips and 11 aircrafts destroyed.

A plume of smoke billows on May 29, from the Nevado del Ruiz volcano, located on the border of the departments of Caldas and Tolima in Colombia, some 130 km west of Bogota in this picture from the Colombian Geological and Mining Institute. Colombian authorities have elevated the alert status in the area to orange due to an increase in the volcano's activity.

People cover their faces to keep them from breathing ashes created by Ruiz volcano's eruption in Manizales, Colombia, on May 29. Colombian authorities elevated the alert to orange, after an unusual increase in the volcano activity.

Former Colombian Interior Minister Fernando Londono, who is injured, walks as he is guarded by a bodyguard after an explosion in a central avenue in Bogota on Tuesday. A bomb attack in a commercial district of Colombia's capital Bogota killed two people on Tuesday and injured Londono who was the target, President Juan Manuel Santos said.

Pedestrians look at the scene after a bomb exploded in Bogota.

Police officers, who are explosives experts, stand at the cordoned scene of an explosion in a central avenue in Bogota.

Injured people, with blood on their faces, walk at the scene of an explosion in a central avenue in Bogota. A bomb attack in a commercial district of Colombia's capital Bogota killed two people on Tuesday and injured a former interior minister who was the target, President Juan Manuel Santos said.

A farmer harvests coffee beans at a farm near Sasaima city in Colombia.

A farmer harvests coffee beans at a farm near Sasaima city on Monday.

Workers prepare roses at Elite greenhouse in Facatativa on Monday.

A worker checks on Gerbera flowers at Elite greenhouse in Facatativa.

An employee arranges a bundle of cotton material inside a workshop of textile factory Fabricato in Bello, Antioquia province on Monday.

An employee pushes bundles of cotton inside a workshop of a textile factory.

A panoramic view of the port of Cartagena on Monday.

A crane operator moves a container at the Port of Cartagena.