John Paul II's shrine

Pope Francis visits predecessor John Paul II's shrine

The Pope called for clergy to leave their comfort zones and tend to the needy on the peripheries of life.

He is on a five-day visit to Poland to mark the 1,050th anniversary of the country's adoption of Christianity.

He is also taking part in World Youth Day, a global celebration for young Catholics.

The Pontiff is due to attend a youth prayer vigil later on Saturday.

Pope Francis began his day with a visit to the Divine Mercy Sanctuary, consecrated by John Paul II during his last visit to Poland in 2003.