A 73-year-old German woman stood peacefully on the street in the German city of Nuremberg.
There she became the victim of a brutal attack, when a man, without warning and for no reason at all, knocked her out and began to kick her in the head.
Passers-by intervened and courageously held the man until the police arrived.
The elderly woman was critically injured and was rushed to the hospital.
The perpetrator is a 24-year-old immigrant from Cameroon, who is officially in the country as a student, writes the German newspaper BILD.
The incident is now investigated as an attempted homicide.
A video of the brutal and meaningless attack, by a man wearing only his underpants, has been posted on YouTube, after Facebook deleted the video.