Pope Francis has announced he will meet a group of sex abuse victims next month after comparing the 'ugly crime' to performing 'a satanic Mass'.
Speaking after his Middle East tour, Pope Francis said he will show zero tolerance for anyone in the Roman Catholic Church who abuses children.
'Sexual abuse is such an ugly crime ... because a priest who does this betrays the body of the Lord,' he said.
The Pope, 77, spoke to reporters for nearly an hour on his flight to Rome.
The BBC's Jeremy Bowen, who travelled with the pontiff, said many Catholics will be glad to hear Pope Francis taking a tough stance.
But it remains unclear if the Pope's zero tolerance policy will extend to bishops who are accused of turning a blind eye to abuse by priests in their dioceses.
Pope Francis said he would meet eight victims and Cardinal Sean Patrick O'Malley, who is head of a commission set up by the Vatican to investigate sex crimes committed by priests and to care for victims.
Cardinal O'Malley said last month he will recommend that negligent clerics be held accountable regardless of their rank in the Church - a move that victims' groups have pressed the Vatican on.
The Pope is under pressure to act after the UN recently published a report accusing the Vatican of systematically placing the 'preservation of the reputation of the Church over the protection of child victims.'.