Humankind's cruelty did not end with the Holocaust, but rages on in the suffering of those living through war, homelessness and persecution, Pope Francis said.

"This cruelty exists today. We say: 'Yes, we have seen cruelty, 70 years ago; how they died shot, hanged or gassed.' But today, in so many places in the world where there is war, the same thing happens," the Pope told a crowd gathered late on Friday outside the archbishop's residence in Kraków where he is staying.

The Pope's words came at the end of a day focused on the suffering of innocents. He had begun the day with a silent prayer at the Auschwitz-Birkenau Nazi death camp in Oswiecim, followed by a visit to a local children's hospital and participation in the Way of the Cross with young people at Blonia Park.