Authorities in Colombia and Mexico said they seized as much as 2 metric tons of cocaine disguised as printer toner in joint operations on Monday at the countries' two main airports.
Police in Bogotá's El Dorado airport were tipped off when a drug-sniffing Labrador named Mona detected the narcotics hidden in 48 boxes of a 1-metric ton cargo shipment bound for a company in the Mexican state of Sinaloa.
Authorities alerted their Mexican counterparts, who found a similar amount sent a few hours earlier on a flight to Mexico City.
Colombia is the largest supplier of cocaine to the U.S. and much of the narcotic lands on American streets through Mexican drug cartels.
Authorities still need to extract the cocaine alkaloid from the toner powder in which it was hidden to determine its final weight.