Extensive flooding that began in December has killed about 35 people and affected about 350,000.
Bolivian President Evo Morales declared a national disaster on Wednesday and said there were problems delivering aid from United States, Venezuela, Italy, Peru, Argentina and other countries to hard-hit areas.
"Evidently, the situation is very drastic. There are many homes in rural areas where a helicopter can't even land to provide food and medicine," Morales said.
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The rivers have risen in recent days and officials are concerned the dike could break and flood the city.
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