Investigations into the recent assassination of Prime Minister Zoran Djindjic revealed a network of private prisons and torture chambers run by a crime syndicate, the Serbian government said this week. The gang, run by former police commander Milorad Lukovic, used private weekend homes and summer cottages across Serbia to carry out kidnappings and killings. More than 1,000 people have been arrested so far in a vast crackdown, including the man suspected of shooting the prime minister. Officials said that Zvezdan Jovanovic, 38, deputy commander of a special police unit, will be charged with the murder. He is thought to be loyal to Lukovic, who is still at large.