BOGOTA, Colombia (AP) — Brazilian police backed by Interpol have destroyed hundreds of dredges used in illegal gold mining along the Madeira River, in one of the biggest coordinated crackdowns yet on criminal networks operating across the Amazon Basin.

The international police agency said officers dismantled 277 floating mining rafts worth an estimated $6.8 million. When factoring in lost gold, equipment and environmental damage, officials estimated the total financial blow to organized crime groups at about $193 million.

The Madeira River, one of the Amazon’s largest tributaries, flows from the Andes through Bolivia into northern Brazil before joining the main Amazon River — an area long plagued by illegal mining and environmental crime.

The raids were led by Brazil’s Federal Police Am

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