The Nazi-hunting Simon Wiesenthal Centre has hung posters on the streets of major German cities seeking information on the last perpetrators of the Holocaust still at large nearly 70 years on.
The 2000 placards feature a chilling black-and-white photograph of the Auschwitz-Birkenau death camp and the tagline: "Late but not too late".
The signs offer a reward of up to €25,000 for information leading to the capture and conviction of Nazi war criminals.
Two recent cases have underlined a new commitment by European authorities to capture the very last of them after decades of foot-dragging, AFP reports.
In June, Hungarian prosecutors charged Laszlo Lajos Csatari, who is 98, with organising the deportation of 12,000 Jews to death camps.
In May, German police arrested a 93-year-old, Hans Lipschis, on charges of complicity in mass murder as an Auschwitz guard.