Police in Ecuador freed an "Ecuadorian-American" citizen after 40 days in captivity and for whom his captors demanded a $3 million ransom, police said.

Citizen F.B. was kidnapped on July 23 in the city of Nueva Loja in the Ecuadorian Amazon, when four individuals burst into the premises of the foundation "For the Survival of the Cofan People" and shackled the employees.

"Relatives of the victim received several calls from a person with a Colombian accent," both from Ecuador and from Colombia, requesting $3 million in exchange for the hostage's release, the National Police said on its Web site.

Investigations led authorities to discover that the citizen was being held in the jungles of Sucumbios province.

"After 40 days of intense investigations and feeling the pressure from the National Police, the kidnappers proceeded to release their captive under pressure," that institution said.

On Friday morning the "Ecuadorian-American" citizen was left "in the dense jungle," and with the help of a National Police airplane was located in the Jehova grounds of the Concha de Vetano sector. EFE