"The date was chosen as a sign of the will to build life and fraternity where others sowed death and destruction," said a communique by the Vatican press office Sept. 11.
He also recalls learning that his colleague and fellow fire chaplain, Franciscan Father Mychal Judge, was among the first known victims of the South Tower's collapse.
Since 2001, attacks worldwide have increased fivefold. From the Sahara Desert to cyberspace, Islamist militants continue to find innovative new ways to extend their reach.
Americans were commemorating 9/11 with somber tributes, volunteer projects and a new monument to victims Tuesday, after a year when two attacks demonstrated the enduring threat of terrorism in the nation's biggest city.
“When so many people rightfully were running out to save their lives, other people were running in.”