(CHICAGO) Three Minnesota women were arrested Tuesday afternoon at O’Hare International Airport carrying more than $3 million worth of heroin and opium.

Pa Yang, 57; Mai Vue Vang, 58; and True Thao, 52 were each charged with one felony count of manufacturing and delivering more than 900 grams of heroin or heroin analogs, according to Chicago Police.

The women were arrested about 4:20 p.m. in Terminal 5 of the airport after they got off a flight from Japan, police said.

U.S. Customs agents found many small packets of heroin and opium adding up to 31.5 kilograms during a luggage screening, police said. The drugs have an estimated street value of more than $3 million.

Yang and Vang are from St. Paul and Thao is from Brooklyn Center, Minnesota, police said. All three are scheduled to appear in bond court Wednesday.