The US has deported to Austria a former Nazi death camp guard, Josias Kumpf. The move sheds light on the continuing search - in some countries, at least - for World War II war criminals. Mario Cacciottolo examines a hunt now entering its final phase. "Looking for Nazi war criminals is the ultimate law enforcement race against the clock." Eli Rosenbaum, director of the Office of Special Investigations (OSI) in the United States, has a list of thousands of suspects. But working out whether any of them are alive and in the US is a laborious job. A full check...