Bolivia's new president-elect, Evo Morales, has vowed to nationalize the country's rich oil and gas reserves.
Bolivian President Evo Morales said on Wednesday that Mr Chavez's situation was "very worrying".
Mamani, the only non-Chilean among the trapped, has been promised help from Bolivian President Evo Morales.
Bolivian President Evo Morales said he had decided to file the suit after "listening to the Bolivian people".
His fellow socialist Evo Morales, Bolivia's president, has also struggled to keep big promises on Indian land rights.
To some of his detractors, Mr Humala is a Peruvian version of Bolivia's Evo Morales (see article).
Evo Morales also confronts domestic criticism as his projects for constitutional reform continue to stagnate and raise animosity.
Uruguayan President Jose Mujica, Bolivian President Evo Morales and Nicaraguan President Daniel Ortega will attend, officials have said.
President Evo Morales said Chile had failed to respond to a deadline he had set for progress in negotiations.
Presidents arrived in the country for the funeral, including Uruguay's Jose Mujica, Argentina's Cristina Kirchner and Bolivia's Evo Morales.
Bolivia's new president, Evo Morales, swept to power in December promising to nationalise the country's oil and gas industry.
On August 10th 2008, Evo Morales was ratified by 67% of the vote.
More than 12, 000 feet above sea level on the windswept Andean plains, 30, 000 Indians await the arrival of Evo Morales.
Bolivia has passed a controversial law which paves the way for President Evo Morales to be elected for a third time.
BBC: Bolivia: New law backs President Evo Morales third term
Evo Morales, for example, as well as leading the country's coca growers, is the head of the opposition Movement Towards Socialism.
As such he has formed coalitions with newly elected populist leaders including Evo Morales of Bolivia and Rafael Correa of Ecuador.
The US has expressed regret at Bolivia's decision to expel America's development agency, rejecting allegations made by President Evo Morales as "baseless".
On Tuesday, Gen Vahidi attended a military ceremony in the city of Santa Cruz, in the presence of Bolivian President Evo Morales.
BBC: Bolivia apologises to Argentina for Iran minister visit
Their long-standing leader, Evo Morales, was elected to Congress in 1997, but has not thereby won any more influence on the government.
Bolivia's President, Evo Morales, has nationalized the country's vast natural gas fields.
One of Chavez's cronies, Bolivian President Evo Morales, has taken similar actions.
CENTERFORSECURITYPOLICY: The economics of Latin American populism
Bolivia has "irrefutable evidence" that the US has been working to destabilise the government of President Evo Morales, a senior minister has said.
BBC: Bolivia accuses United States of plotting against Morales
Bolivian President Evo Morales had said on Jan. 22 that Chavez was "receiving physical therapy" so that he could return home to Venezuela.
Peruvian newspapers claim that radical Bolivian indigenous militants supported by Evo Morales are also working with radical Peruvian indigenous groups including Pizango's group.
Chavez also ushered in a new area of populist leaders including Rafael Correa in Ecuador, Evo Morales in Bolivia and Daniel Ortega in Nicaragua.
Bolivian President Evo Morales has said that US anti-drug agents are not welcome back in his country, despite an agreement to restore diplomatic ties.
As expected, the members of the UNASUR expressed their support for Bolivia's Evo Morales and unanimously condemned the actions of the four provincial governors.
Bolivia's recently elected socialist president, Evo Morales, led troops into a Brazilian-run gasfield and unveiled a decree nationalising his country's oil and gas industry.
Company shares were hit hard in May, dropping 31% after the new Bolivian President Evo Morales decided to nationalize his nation's oil and gas industry.
In Bolivia, President Evo Morales has built a strong base of support among the poor in the country's high plains since taking office in 2006.
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