The Peruvian National Police's Financial Intelligence Unit reported on Tuesday that money laundering transactions linked to drug trafficking totaled about $250 million in 2015.

During the opening of the 33rd International Drug Enforcement Conference in Lima, Peruvian Interior Minister Jose Luis Perez Guadalupe said the information was of "great concern" for the 500 officials from 124 countries who have gathered for the two-day meeting.

Perez Guadalupe said Peruvian authorities still did not have a clear estimate of the amount of undeclared money that flows through the country from illegal drug production and trafficking.

IDEC is organized by the National Police and the U.S. Drug Enforcement Administration, and this year's theme is combating international organizations engaged in drug trafficking and laundering assets.