NEW YORK - The entire nation is joining New Yorkers in remembering the tragic events of Sept. 11 on its 12th anniversary.

The traditional reading of names was held at Ground Zero in Manhattan, which began with a bell toll and moment of silence at 8:46 a.m., the exact time when the first plane hit in 2001.

Relatives then stood on the 2-year-old memorial plaza to recite the names aloud of the nearly 3,000 people who died when hijacked planes crashed into the twin towers, the Pentagon and in western Pennsylvania. It included the victims of the 1993 World Trade Center bombing.

Continuing with a decision made last year, no politicians spoke, including Mayor Michael Bloomberg.

An honor guard also made a special delivery to the site. The group, made up of NYPD, FDNY and Port Authority members, delivered a tattered flag to the World Trade Center stage.

President Barack Obama marked the anniversary with a moment of silence at the White House. He also laid a wreath at the Pentagon.

Other ceremonies included a tribute in Shanksville, where another plane went down in a field near the small town.