The trial of six Bulgarian health workers accused of deliberately infecting 393 Libyan children with HIV has again been postponed, leaving the workers imprisoned in Libya now for more than three years while awaiting trial, Agence France-Presse reports. The trial was indefinitely postponed again on Tuesday. No other details were announced at the hearing. The six, five nurses and one doctor, were arrested in 1998 and charged with deliberately infecting the children at a hospital in Begnhazi, Libya. If found guilty, all six face the death penalty. The Bulgarians also are charged with illegally distributing alcohol, having sex outside of marriage, and trading currency on the black market. All six health workers have pleaded not guilty to the charges.