In an ominous sign for US coca eradication efforts in South America, the Brazilian military said Sunday it had for the first time discovered coca plantations and a cocaine laboratory on its national territory. Coca has been grown by indigenous people in the Andes for thousands of years, and in recent years, three countries -- Colombia, Peru, and Bolivia -- have accounted for all the world's coca leaf.

The Brazilian army used helicopters and small boats to reach the coca fields and lab in a remote area near the northwestern city of Tabatinga, close to the borders with Peru and Colombia. The fields were discovered when satellite photos showed large clearings hacked out of the jungle.

Lt. Col. Antônio Elcio Franco Filho told reporters Sunday finding coca plants was a surprise. "It is the first time these plantations have been found in Brazil," he said, adding that the find had prompted authorities to look for more fields in the region.

"This is new in Brazil and it's a concern," Walter Maierovitch, an organized crime expert who once headed Brazil's anti-drug efforts, told the government's Agência Brasil news service. "It could mean a change in the geo-strategy of some Colombian cartels."

While coca grows well in the Andean-Amazon highlands, the climate in the Amazon basin is not believed to be favorable to coca cultivation. But according to Franco Filho, the leaf growing in Brazil could be adapted to that climate.

"We believe they are using a transgenic or an adaptation of the leaf used in the Andean region," Franco Filho said. "They are probably trying to find new locations to grow this, so we need to stay alert. Authorities need to crack down on them immediately. If we don't do anything it might even become a source of deforestation."

By Monday, US anti-drug officials were raising alarms. "Brazilian law enforcement is going to have to be vigilant on this front, so it doesn't become a major producer," DEA spokesman Garrison Courtney told the Associated Press. If coca can be successful grown there, said Courtney, "the Amazon would be a perfect area, with all the brush and uninhabited areas. It almost creates a perfect opportunity. Drug traffickers and organizations are always moving to new areas."

No one was arrested in the raid. Brazil, whose status as the world's number two cocaine consumer nation may be threatened by the rising popularity of the drug in Europe, may now be about to join the elite ranks of the coca producing nations.