Pope Francis lands in Poland on Wednesday amid heavy security for an international Catholic youth festival where he is expected to make the case for welcoming refugees, a thorny issue for Warsaw.
With Europe reeling from a series of terror attacks targeting civilians, Poland will deploy over 20,000 policemen and has temporarily restored border checks with EU neighbours.
Though World Youth Day organisers expected nearly two million pilgrims, only around 400,000 have officially registered.
(AFP)