The four Montenegrin men, aged between 24 and 32, were charged with the illegal transport of migrants and with forgery of documents.
The suspects were nabbed by the Croatian police in the hamlet of Kukača in the morning of 31 March, while they were transporting irregular Afghan migrants on their way to west Europe.
The migrants were placed in the trunks of the two cars driven by the Montenegrins, and they were being transported in life-threatening conditions, being concealed in a small space without enough air to breathe, according to the report issued by the local prosecutor.