The Simon Wiesenthal Center is displaying posters across major German cities in the hope that someone might come forward with information that will lead to the capture and conviction of the last surviving perpetrators of the Holocaust.
It is nearly 70 years since around six million Jews were murdered by the Nazi regime but the centre's new posters carry a poignant tagline reminding Germans that it is "late but not too late" to catch them.
The 2,000 posters show a black-and-white photo of the Auschwitz-Birkenau death camp and are going on display as part of its "Operation Last Chance".
People with information that leads to the capture and conviction of Holocaust perpetrators are being offered a reward of up to 25,000 euros.
The posters will be displayed in the capital Berlin, as well as Hamburg and Cologne.
The posters read: "Millions of innocents were murdered by Nazi war criminals. Some of the perpetrators are free and alive. Help us to bring them before a court."
The campaign has been initiated by the centre's chief Nazi-hunter and Israel director Dr Efraim Zuroff following the recent conviction of Ivan Demjanjuk for his role as an armed SS guard at the Sobibor death camp.
Zuroff said it was important for people to remember that "the passage of time in no way diminishes the guilt of the killers".
"Old age should not afford immunity to murderers," he said.
