Pope Francis viewed evocative artifacts of the Sept. 11 terrorist attacks at ground zero before leaving the museum that memorializes it Friday.

He spoke at an interfaith service, calling for the world to build unity from its differences. It was held in a hall framed partly by an underground flood wall that became an emblem of resilience when it held fast after the attack. Standing nearby was the memento-covered steel column that was the last one removed from the wreckage.

Francis also toured some of the exhibits, including a cross-shaped steel beam found amid the debris.

He says the world must look to its diversity of languages, cultures and religions and throw away "feelings of hate and revenge and rancor." The Pontiff says he was moved by visiting the site of the former World Trade Center's twin towers and by meeting relatives of some of the nearly 3,000 victims.

And he prayed to God to bring "peace to our violent world" and to "turn to your way of love" those who justify killing in the name of religion.

Francis visited the museum as part of a three-city U.S. tour. He then departed for a break before resuming his day's busy schedule.

(© 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed)

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