These are 80 year-old photographic film prints being released by the Warsaw-based POLIN Museum of the History of Polish Jews, as per this article here by Ofer Aderet at Ha’aretz. As per Aderet, whose language I am cribbing below, the photographs were taken by Polish civilians.
One series was secretly shot by a Polish fireman, Z. Leszka Grzywaczewski, who was age 23 at the time. He was sent into the ghetto to extinguish fires set by the Germans suppressing the rebellion. His photographs represent Jews being rounded up by the Nazis to be sent to death; there are also photographs of Polish firefighters A second series was documented by a Polish engineer Rudolf Damec outside the ghetto. They represent Polish civilians looking over the walls at the burning ghetto.
These are precious historical documents. Most Holocaust photographs were taken by the German perpetrators. Of note in these photographs are the point-of-view reflections of Polish bystander-civilians witnessing the Nazi genocide of the Jews. The bystander photographs are shot from behind. No faces are shown. I think they seem to register shock.