Four South Korean individuals and five entities were on Monday formally accused of illegally importing North Korean coal and other sanctioned commodities into the country, the Daegu District Public Prosecutor’s Office said.

A 44-year-old South Korean female was arrested and charged on suspicion of violating the Inter-Korean Exchange and Cooperation Act, while three individuals and five corporate bodies were indicted without detention last Friday.

In an interim report, the prosecution said the defendants had brought North Korean coal into the South by obscuring its country of origin through, among other techniques, the creation of false certificate of origin and transhipment