Vietnamese prosecutors have decided to charge two Ho Chi Minh City students with smuggling more than four kilograms of methamphetamines into Vietnam in July.
Tran Ha Duy, 22, and her sister Tran Ha Tien, 20, are being charged with "illegal drug transportation."
Under Vietnamese laws, possession, transport, or trade of more than 600 grams of heroin or cocaine or more than 2.5 kilogram of methamphetamine can be punished with death.
The case was busted on July 18 when security and customs officials at HCMC's Tan Son Nhat International Airport found Tien carrying the drug into Vietnam on a flight from Qatar.
Duy, a student of the Hong Bang University in Ho Chi Minh City, gave herself up to the police after being informed about Tien's arrest.
Initial investigations have found that Tien was involved in a trafficking ring that brought drugs from Tanzania in Africa to Vietnam via Qatar.
Shortly after Tien's arrest, the police also apprehended Huynh Ngoc Loi, 22, a suspected ring member, and seized 4 kilograms of methamphetamine from a suitcase in his house in HCMC.
Duy told the police she knew a man of African origin named Francis who she met on a bus in 2007, and they kept in touch.
In August 2010, Francis asked her to join his business by delivering clothes and shoes to foreign countries, and she accepted. She also introduced her sister, Tien, also a student of the Hong Bang University, to the business.
Duy said she had successfully delivered four batches one from Malaysia to Indonesia and others from Benin, a West African country, to Malaysia, Indonesia and the Philippines via Vietnam between August 2010 and July 2011.
She was paid US$1,000 for each trip. She told the police she had not known that drugs were hidden in the suitcases during the first three trips.
When she realized she was transporting drugs in the final trip, Francis forced her to keep silent, she said.
The import and export of methamphetamine via non-commercial means is prohibited under Vietnamese law.