Calling on the world's bishops not to cover up any instance or form of abuse, Pope Francis said the evil of abuse must be exposed.

Pope Francis on Sunday wrapped up a weekend trip to Belgium, where he faced some of the strongest criticism yet levied during one of his foreign trips. The 87-year-old pontiff was pressed by high-profile figures at three of the five major events on his three-day visit in unusual and sometimes fierce language for a papal trip.

Pope Francis urged Catholic bishops to be more transparent and aggressive in combatting child sex abuse in the Church during his visit to Belgium on Sunday, declaring that “evil must not be hidden” and “must be brought out into the open.