The Latest: Moment of silence for 9/11 terror attack victims

People gather for a ceremony marking the 18th anniversary of the attacks of Sept. 11, 2001 at the National September 11 Memorial, Wednesday, Sept. 11,

People gather for a ceremony marking the 18th anniversary of the attacks of Sept. 11, 2001 at the National September 11 Memorial, Wednesday, Sept. 11,

New York City firefighters take a position in front of a memorial on the side of a firehouse adjacent to One World Trade Center and the 9/11 Memorial

New York City firefighters take a position in front of a memorial on the side of a firehouse adjacent to One World Trade Center and the 9/11 Memorial

New York City firefighters salute in front of a memorial on the side of a firehouse adjacent to One World Trade Center and the 9/11 Memorial site duri

New York City firefighters salute in front of a memorial on the side of a firehouse adjacent to One World Trade Center and the 9/11 Memorial site duri

FILE- In this May 15, 2015 file photo, visitors gather near the pools at the 9/11 Memorial in New York. As they have done 17 times before, a crowd of

FILE- In this May 15, 2015 file photo, visitors gather near the pools at the 9/11 Memorial in New York. As they have done 17 times before, a crowd of

FILE- In this Sept. 9, 2015 file photo, visitors look at the waterfalls at the World Trade Center Memorial in New York. As they have done 17 times bef

FILE- In this Sept. 9, 2015 file photo, visitors look at the waterfalls at the World Trade Center Memorial in New York. As they have done 17 times bef

Kiersten Haub, from left, Erika Starke, and Michael Haub, family members of New York firefighter Michael Haub, attend a second funeral service for him

Kiersten Haub, from left, Erika Starke, and Michael Haub, family members of New York firefighter Michael Haub, attend a second funeral service for him

A visitor to the Flight 93 National Memorial in Shanksville, Pa., views the Wall of Names on Tuesday, Sept. 10, 2019, as the nation prepares to mark t

A visitor to the Flight 93 National Memorial in Shanksville, Pa., views the Wall of Names on Tuesday, Sept. 10, 2019, as the nation prepares to mark t

Visitors to the Flight 93 National Memorial in Shanksville, Pa., participate in a sunset memorial service on Tuesday, Sept. 10, 2019, as the nation pr

Visitors to the Flight 93 National Memorial in Shanksville, Pa., participate in a sunset memorial service on Tuesday, Sept. 10, 2019, as the nation pr

New York Fire Department members attend a second funeral service for FDNY firefighter Michael Haub in Franklin Square, N.Y., Tuesday, Sept. 10, 2019.

New York Fire Department members attend a second funeral service for FDNY firefighter Michael Haub in Franklin Square, N.Y., Tuesday, Sept. 10, 2019.

Visitors to the Flight 93 National Memorial in Shanksville, Pa., participate in a sunset memorial service on Tuesday, Sept. 10, 2019, as the nation pr

Visitors to the Flight 93 National Memorial in Shanksville, Pa., participate in a sunset memorial service on Tuesday, Sept. 10, 2019, as the nation pr

New York Fire Department members attend a second funeral service for FDNY firefighter Michael Haub in Franklin Square, N.Y., Tuesday, Sept. 10, 2019.

New York Fire Department members attend a second funeral service for FDNY firefighter Michael Haub in Franklin Square, N.Y., Tuesday, Sept. 10, 2019.

Norma Molina, of San Antonio, Texas, leaves flowers by the names of firefighters from Engine 33 at the September 11 Memorial, Monday, Sept. 9, 2019, i

Norma Molina, of San Antonio, Texas, leaves flowers by the names of firefighters from Engine 33 at the September 11 Memorial, Monday, Sept. 9, 2019, i

FILE - In this Sept. 11, 2001, file photo, smoke rises from the burning twin towers of the World Trade Center after hijacked planes crashed into the t

FILE - In this Sept. 11, 2001, file photo, smoke rises from the burning twin towers of the World Trade Center after hijacked planes crashed into the t

FILE - In this Sept. 11, 2001, file photo, firefighters work beneath the destroyed mullions, the vertical struts that once faced the outer walls of th

FILE - In this Sept. 11, 2001, file photo, firefighters work beneath the destroyed mullions, the vertical struts that once faced the outer walls of th

New York City firefighters take their positions in front of a memorial on the side of a firehouse adjacent to One World Trade Center and the 9/11 Memo

New York City firefighters take their positions in front of a memorial on the side of a firehouse adjacent to One World Trade Center and the 9/11 Memo

New York City firefighters stand at attention in front of a memorial on the side of a firehouse adjacent to One World Trade Center and the 9/11 Memori

New York City firefighters stand at attention in front of a memorial on the side of a firehouse adjacent to One World Trade Center and the 9/11 Memori

NEW YORK (AP) — The Latest on the 18th anniversary of the Sept. 11, 2001, terror attacks (all times local):

8:45 a.m.

The commemoration of the 18th anniversary of the Sept. 11 terror attacks has begun at ground zero with a moment of silence and tolling bells.

Victims' relatives and dignitaries were gathered on the memorial plaza at the World Trade Center in New York as the ceremony started at 8:46 a.m. Wednesday. That is the time when a hijacked plane slammed into the World Trade Center's north tower on Sept. 11, 2001.

Then victims' loved ones began reading the names of the nearly 3,000 people killed when a total of four hijacked planes crashed into the trade center, the Pentagon and a Pennsylvania field.

President Donald Trump is attending an observance at the Pentagon. Vice President Mike Pence is speaking at the 9/11 memorial near Shanksville, Pennsylvania.

___

12 a.m.

Americans are commemorating 9/11 with mournful ceremonies, volunteering, appeals to "never forget" and rising attention to the terror attacks' extended toll on responders.

A crowd of victims' relatives is expected at ground zero Wednesday. President Donald Trump is scheduled to join an observance at the Pentagon.

Vice President Mike Pence is to speak at the third attack site, near Shanksville, Pennsylvania.

Eighteen years after the deadliest terror attack on American soil, the nation is still grappling with the aftermath at ground zero, in Congress and beyond.

The attacks' aftermath is visible from airport security checkpoints to Afghanistan, where a post-9/11 invasion has become America's longest war.

Nearly 3,000 people were killed when hijacked planes rammed into the World Trade Center, the Pentagon and a Shanksville field on Sept. 11, 2001.