People watch the World Trade Center fire from St. Patrick's Cathedral in New York on Sept. 11, 2001.
Saint Patrick's Cathedral will hold a special memorial Mass on Sunday, Sept. 11 to mark the 10th anniversary of the terror attacks.
Archbishop Timothy Dolan will lead the Mass at 9 a.m., the New York Archdiocese said Tuesday.
Stunned crowds gathered outside Saint Patrick's on the morning of the attacks and watched the burning towers.
Later, the cathedral held dozens of funerals and memorials for victims after the disaster.
The 9 a.m. Mass will be held at the same time as the official remembrance in Lower Manhattan, which will include moments of silence at the times the two planes hit, and the collapses of the twin towers.
The first plane struck the north tower at 8:46 a.m.
Dolan will also lead a Mass at Saint Peter's Church near ground zero at 12:30 p.m.