Pope Francis says the rise of terrorism is being fueled by the worship of money.

"Terrorism grows when there is no alternative, when at the center of the society is the God of Money, not the person, the man and woman, the family," he told reporters on a flight back to Rome after a visit to Poland.

"When the glory of creation and a man and woman has been thrown away and money has been replaced as its center, this is a terrorism against all of humanity."