Photos: 9/11 Observances Across the U.S.

See how people across the U.S. observed the anniversary.

New York - On today, the 10th anniversary of the 9/11 terror attacks on the U.S. that killed almost 3,000, people across the U.S. observed the painful anniversary. See how people across the U.S. observed the anniversary. At the World Trade Center site in New York City, a commemorative pool of the 9/11 Memorial is observed, in tribute to the fallen victims, during the anniversary ceremonies.(Photo: Andrew Burton/Getty Images)

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New York - On today, the 10th anniversary of the 9/11 terror attacks on the U.S. that killed almost 3,000, people across the U.S. observed the painful anniversary. See how people across the U.S. observed the anniversary. At the World Trade Center site in New York City, a commemorative pool of the 9/11 Memorial is observed, in tribute to the fallen victims, during the anniversary ceremonies.(Photo: Andrew Burton/Getty Images)

The First Couple Pay Their Respects - The president and first lady walk to the 9/11 memorial in New York City.(Photo:  Justin Sullivan/Getty Images)

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The First Couple Pay Their Respects - The president and first lady walk to the 9/11 memorial in New York City.(Photo:  Justin Sullivan/Getty Images)

Presidential Observances - The Obamas are joined by former President George W. Bush and his wife, former first lady Laura Bush, in New York City. (Photo: AP Photo/Pablo Martinez Monsivais)

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Presidential Observances - The Obamas are joined by former President George W. Bush and his wife, former first lady Laura Bush, in New York City. (Photo: AP Photo/Pablo Martinez Monsivais)

Honoring Fallen Heroes - FDNY firefighters observe a moment of silence to mark the anniversary and honor the 343 firefighters who died in the line of duty.(Photo:  Justin Sullivan/Getty Images)

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Honoring Fallen Heroes - FDNY firefighters observe a moment of silence to mark the anniversary and honor the 343 firefighters who died in the line of duty.(Photo:  Justin Sullivan/Getty Images)

FDNY Mourns - FDNY firefighter Dwayne Richards of Ladder Company 20 pauses for a moment of silence.(Photo: Justin Sullivan/Getty Images)

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FDNY Mourns - FDNY firefighter Dwayne Richards of Ladder Company 20 pauses for a moment of silence.(Photo: Justin Sullivan/Getty Images)

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Tribute in Light - People view the Tribute in Light from the Top of the Rock observation deck on Saturday. The Tribute in Light is an art installation honoring those who perished in the attacks.(Photo: Mario Tama/Getty Images)

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Tribute in Light - People view the Tribute in Light from the Top of the Rock observation deck on Saturday. The Tribute in Light is an art installation honoring those who perished in the attacks.(Photo: Mario Tama/Getty Images)

A Family Waits - Tyrus Colbert, whose father is in the military, sits with his family near the World Trade Center site on the morning of September 11.(Photo: Spencer Platt/Getty Images)

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A Family Waits - Tyrus Colbert, whose father is in the military, sits with his family near the World Trade Center site on the morning of September 11.(Photo: Spencer Platt/Getty Images)

9/11 Memorial North Pool - A view of the bronze panels bearing the names of the victims around the perimeter of the 9/11 Memorial north pool, before the area is opened to families on Sunday. (Photo: Chip Somodevilla/Getty Images)

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9/11 Memorial North Pool - A view of the bronze panels bearing the names of the victims around the perimeter of the 9/11 Memorial north pool, before the area is opened to families on Sunday. (Photo: Chip Somodevilla/Getty Images)

A Father Mourns - Robert Peraza, who lost his son Robert David Peraza in the attacks at the World Trade Center, pauses at his son's name at the north pool of the 9/11 Memorial.(Photo: AP Photo/Justin Lane, Pool)

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A Father Mourns - Robert Peraza, who lost his son Robert David Peraza in the attacks at the World Trade Center, pauses at his son's name at the north pool of the 9/11 Memorial.(Photo: AP Photo/Justin Lane, Pool)

Hugs From the First Family - President Obama and First Lady Michelle Obama hug attendees at the ceremony.(Photo:  David Handschuh-Pool/Getty Images)

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Hugs From the First Family - President Obama and First Lady Michelle Obama hug attendees at the ceremony.(Photo:  David Handschuh-Pool/Getty Images)

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A Mother and Brother Mourn - New York firefighter Zachary Fletcher embraces his mother Monica Fletcher after finding his twin brother Andre G. Fletcher's name engraved at the south pool of the National September 11 Memorial.(Photo: AP Photo/Mary Altaffer)

Saying Goodbye to a Friend - Nia Evans, who lost a friend at the World Trade Center, observes a moment of silence during ceremonies. (Photo:  Spencer Platt/Getty Images)

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Saying Goodbye to a Friend - Nia Evans, who lost a friend at the World Trade Center, observes a moment of silence during ceremonies. (Photo:  Spencer Platt/Getty Images)

Waiting for the Ceremony to Start - Teneal Colbert, 15, with her brother Fredrick Meeks, 9, left, and brother Tyrus Colbert, 14, top left, of Garden City, New York, watch a large monitor broadcasting ceremonies near the Trade Center site Sunday. (Photo: AP Photo/Craig Ruttle)

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Waiting for the Ceremony to Start - Teneal Colbert, 15, with her brother Fredrick Meeks, 9, left, and brother Tyrus Colbert, 14, top left, of Garden City, New York, watch a large monitor broadcasting ceremonies near the Trade Center site Sunday. (Photo: AP Photo/Craig Ruttle)

Feeling Unsafe in a Post-9/11 World - According to a new NBC News/Wall Street Journal poll 47 percent of Americans say the country is less safe since the Sept. 11 terrorist attacks, while 26 percent said it's safer. In 2002 and 2013, just 20 percent and 28 percent, respectively, said the country was less safe.(Photo by David Handschuh-Pool/Getty Images)

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A Vet Pays His Respects - New York City Police Officer Danny Shea, a military veteran, salutes at the north pool of the 9/11 Memorial.(Photo: David Handschuh-Pool/Getty Images)

Obama's Quiet Moment - The president touches names of the 9/11 victims as he visits the north memorial pond in New York City. (Photo: AP Photo/Pablo Martinez Monsivais)

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Obama's Quiet Moment - The president touches names of the 9/11 victims as he visits the north memorial pond in New York City. (Photo: AP Photo/Pablo Martinez Monsivais)

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NYC's Mayor - New York City Mayor Michael Bloomberg speaks during anniversary ceremonies. (Photo: Andrew Burton/Getty Images)

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NYC's Mayor - New York City Mayor Michael Bloomberg speaks during anniversary ceremonies. (Photo: Andrew Burton/Getty Images)

The Ceremony - Attendees at the New York City ceremonies.  (Photo: Andrew Burton/Getty Images)

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The Ceremony - Attendees at the New York City ceremonies.  (Photo: Andrew Burton/Getty Images)

Moment of Silence - Family members mourn as they observe a moment of silence at 9:37 a.m. ET, the time of impact, at a remembrance ceremony at the Pentagon in Arlington, Virginia. (Photo: Win McNamee/Getty Images)

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Moment of Silence - Family members mourn as they observe a moment of silence at 9:37 a.m. ET, the time of impact, at a remembrance ceremony at the Pentagon in Arlington, Virginia. (Photo: Win McNamee/Getty Images)

Gathering to Remember - Families and survivors honor victims of the attack on the Pentagon at the Pentagon Memorial in Washington, DC.(Photo: AP Photo/J. Scott Applewhite)

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Gathering to Remember - Families and survivors honor victims of the attack on the Pentagon at the Pentagon Memorial in Washington, DC.(Photo: AP Photo/J. Scott Applewhite)

A Tearful Moment - Families and survivors honor victims of the attack on the Pentagon at the Pentagon Memorial. (Photo: AP Photo/J. Scott Applewhite)

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A Tearful Moment - Families and survivors honor victims of the attack on the Pentagon at the Pentagon Memorial. (Photo: AP Photo/J. Scott Applewhite)

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Overcome With Emotion - Family members mourn at the Pentagon.  (Photo:  Win McNamee/Getty Images)

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Overcome With Emotion - Family members mourn at the Pentagon.  (Photo:  Win McNamee/Getty Images)

Officials Attend Ceremonies - (L-R) Chairman of the Joint Chiefs of Staff Michael Mullen, Secretary of Defense Leon Panetta and Vice President Joe Biden take part in the remembrance ceremony at the Pentagon. (Photo:  Win McNamee/Getty Images)

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Officials Attend Ceremonies - (L-R) Chairman of the Joint Chiefs of Staff Michael Mullen, Secretary of Defense Leon Panetta and Vice President Joe Biden take part in the remembrance ceremony at the Pentagon. (Photo:  Win McNamee/Getty Images)

Dedication in Shanksville - Former President George W. Bush, former first lady Laura Bush, former President Bill Clinton, Dr. Jill Biden and Vice President Joe Biden stand together after arriving on the stage to attend the dedication of phase 1 of the permanent Flight 93 National Memorial near the crash site of Flight 93 in Shanksville, Pennyslvania, Saturday.  (Photo: AP Photo/Gene J. Puskar)

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Dedication in Shanksville - Former President George W. Bush, former first lady Laura Bush, former President Bill Clinton, Dr. Jill Biden and Vice President Joe Biden stand together after arriving on the stage to attend the dedication of phase 1 of the permanent Flight 93 National Memorial near the crash site of Flight 93 in Shanksville, Pennyslvania, Saturday.  (Photo: AP Photo/Gene J. Puskar)

Military Personnel Pay Their Respects - U.S. military personnel in Shanksville bow their heads as they observe a moment of silence to mark the exact time when the first hijacked airplane crashed into the World Trade Center Sunday.(Photo: AP Photo/Amy Sancetta)

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Military Personnel Pay Their Respects - U.S. military personnel in Shanksville bow their heads as they observe a moment of silence to mark the exact time when the first hijacked airplane crashed into the World Trade Center Sunday.(Photo: AP Photo/Amy Sancetta)

The Arrival - Visitors arrive for ceremonies to mark the 10th anniversary of Sept. 11 near the crash site of Flight 93 in Shanksville. (Photo: AP Photo/Gene J. Puskar)

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The Arrival - Visitors arrive for ceremonies to mark the 10th anniversary of Sept. 11 near the crash site of Flight 93 in Shanksville. (Photo: AP Photo/Gene J. Puskar)

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Honorary Flags at St. Patrick's Cathedral  - Flags are carried into New York's St. Patrick's Cathedral Saturday during a memorial ceremony to honor New York firefighters that were killed in the attacks on the World Trade Center.(Photo: Seth Wenig-Pool/Getty Images)

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Honorary Flags at St. Patrick's Cathedral - Flags are carried into New York's St. Patrick's Cathedral Saturday during a memorial ceremony to honor New York firefighters that were killed in the attacks on the World Trade Center.(Photo: Seth Wenig-Pool/Getty Images)

Old Glory - A man walks among nearly 3,000 flags set up as part of a remembrance  in St. Louis, MO.(Photo: AP Photo/Jeff Roberson)

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Old Glory - A man walks among nearly 3,000 flags set up as part of a remembrance  in St. Louis, MO.(Photo: AP Photo/Jeff Roberson)