Authorities discovered more than 70 pounds of cocaine that was hidden inside a freight shipment of boxes in DeKalb County on Monday.

The county's High Intensity Drug Trafficking Areas unit and DeKalb police worked a "package interdiction operation" near Moreland Avenue and I-285, police said in a news release. During that search, K9 teams walked through a dock area, sniffing packages and freight.

DeKalb K9 Argo eventually alerted police that there might be narcotics hidden on a pallet of cardboard boxes, the release said. After obtaining search warrants, police found millions of dollars worth of cocaine inside two boxes.

One box contained 20 kilograms (about 44 pounds) of cocaine, while another contained about 12 kilograms, the release said. The seized drugs have an estimated street value of $3.5 million.

Police spokeswoman Michaela Vincent told AJC.com that no was was arrested in connection with the bust. She added that she could not disclose why authorities were performing a “package interdiction operation” in that area.

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The man, who police said is in his late 40s, was taken to the hospital and is stable.