The NYPD on Friday commemorated the 15th anniversary of the 9/11 terrorist attacks at the World Trade Center.

The Emerald Society Pipes & Drums led a procession through lower Manhattan to the Battery Park Police Memorial. The memorial wall bears the names of NYPD members who died in the line of duty, including the 23 killed on Sept. 11, 2001.

See photos of the procession below.

NYPD Chief of Detectives Robert Boyce views the
NYPD Chief of Detectives Robert Boyce views the parade and ceremony on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
From left, Public Advocate Letitia James, lawyer Rikki
From left, Public Advocate Letitia James, lawyer Rikki Klieman, NYPD Commissioner William Bratton and NYPD Chief of Department James O'Neill march in the parade and ceremony on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
Pipers march in the parade and ceremony on
Pipers march in the parade and ceremony on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)

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Pipers march in the parade and ceremony on
Pipers march in the parade and ceremony on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
From left, Public Advocate Letitia James, lawyer Rikki
From left, Public Advocate Letitia James, lawyer Rikki Klieman, NYPD Commissioner William Bratton, NYPD Chief of Department James O'Neill, and NYPD Assistant Chief Steven Powers in the parade on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
Pipers march in the parade on Friday, Sept.
Pipers march in the parade on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
Pipers march in the parade on Friday, Sept.
Pipers march in the parade on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
Pipers play
Pipers play "Amazing Grace" on Friday, Sept. 9, 2016, during the ceremony to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)

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Mayor Bill de Blasio speaks during the ceremony
Mayor Bill de Blasio speaks during the ceremony at the Battery Park Police Memorial on Friday, Sept. 9, 2016, to honor NYPD officers who died in the Sept. 11 terror attacks. (Credit: Jeff Bachner)
Shari Hyman, of Battery Park City, speaks during
Shari Hyman, of Battery Park City, speaks during the ceremony at the Battery Park Police Memorial on Sept. 9, 2016. (Credit: Jeff Bachner)
"Taps" is played during the ceremony on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
NYPD Commissioner William Bratton speaks during the ceremony
NYPD Commissioner William Bratton speaks during the ceremony to honor NYPD officers who died in the 9/11 terror attacks, at the Battery Park Police Memorial on Friday, Sept. 9, 2016. (Credit: Jeff Bachner)
From left, Mayor Bill de Blasio, NYPD Commissioner
From left, Mayor Bill de Blasio, NYPD Commissioner William Bratton and his wife, Rikki Klieman, at the parade and ceremony on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)

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Canadian police officers march in the parade to
Canadian police officers march in the parade to honor NYPD officers who died in the 9/11 terror attacks, on Friday, Sept. 9, 2016. (Credit: Jeff Bachner)
Pipers march in the parade to honor NYPD
Pipers march in the parade to honor NYPD officers who died in the 9/11 terror attacks, on Friday, Sept. 9, 2016. (Credit: Jeff Bachner)
NYPD Commissioner William Bratton and his wife Rikki
NYPD Commissioner William Bratton and his wife Rikki Klieman view the parade and ceremony to honor NYPD officers who died in the 9/11 terror attacks, on Friday, Sept. 9, 2016. (Credit: Jeff Bachner)
From left, Public Advocate Letitia James, lawyer Rikki
From left, Public Advocate Letitia James, lawyer Rikki Klieman, NYPD Commissioner William Bratton and NYPD Chief of Department James O'Neill march in the parade on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
Police Benevolent Association president Patrick Lynch, center, marches
Police Benevolent Association president Patrick Lynch, center, marches in the parade on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
NYPD Chief of Department James O'Neill and Public
NYPD Chief of Department James O'Neill and Public Advocate Letitia James watch the parade and ceremony on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
From left, Mayor Bill de Blasio, NYPD Commissioner
From left, Mayor Bill de Blasio, NYPD Commissioner William Bratton, and his wife Rikki Klieman view the parade on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
NYPD Chief of Detectives Robert Boyce sits in
NYPD Chief of Detectives Robert Boyce sits in a vehicle during the parade and ceremony on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
Bagpipers tune up before the parade and ceremony
Bagpipers tune up before the parade and ceremony on Friday, Sept. 9, 2016, to honor NYPD officers who died in the 9/11 terror attacks. (Credit: Jeff Bachner)
Mayor Bill de Blasio speaks during the ceremony
Mayor Bill de Blasio speaks during the ceremony at the Battery Park Police Memorial on Friday, Sept. 9, 2016, to honor NYPD officers who died in the Sept. 11 terror attacks. (Credit: Jeff Bachner)
NYPD cadets march in the parade on Friday,
NYPD cadets march in the parade on Friday, Sept. 9, 2016, to honor NYPD officers who died in the Sept. 11 terror attacks. (Credit: Jeff Bachner)