Appeal to find remaining Nazi war criminals
"Late, but not too late" - the message on an advert which has gone up at 2,000 poster sites across Germany.
It encourages people to identify and tell police about the last remaining Nazi war criminals still alive in the country.
The man behind the campaign has told BBC World Service's Newshour why he felt it was necessary.
You can hear from him just after a report from the BBC's Berlin correspondent Stephen Evans, who asked people in the city what they thought about the adverts.