Slain NYPD Officer Randolph Holder was remembered in a moment of silence Thursday afternoon when police officers at the World Trade Center laid flowers at the Sept. 11 memorial's south reflecting pool.

"It's a sad occasion but important to remind the world that police officers are getting up everyday to put their lives on the line and this is a place for the city and the country to do just that," said Joe Daniels, president and chief executive of the National September 11 Memorial & Museum.

Beside several dozen police officers from the NYPD and Port Authority, employees from the museum also placed flowers at the edge of the reflecting pool where the names of those killed on 9/11 are engraved. A similar ceremony was done for NYPD Dets. Wenjian Liu and Rafael Ramos, who were shot dead by a lone gunman who then killed himself last December in Brooklyn.

Daniels said the Sept. 11 memorial south reflecting pool "is a place to recognize the sacrifice of all responders . . . to have these murders happen is unacceptable."

Holder was shot in the head after he and his partner chased down Tyrone Howard, 30, of East Harlem, who was involved in a gunfight Tuesday night.

NYPD Deputy Inspector Kevin Burke, who oversees the World Trade Center command center, said Holder's death "is sad. He was a young man whose life was snuffed out . . . a man just beginning his career. It's terrible."

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"This reminds all of us that policing remains a dangerous profession and we have to be ready for all events," said Port Authority Deputy Inspector Ron Shindel.

Holder is the fourth NYPD officer to be killed in the line of duty in less than a year.

Daniels said laying down flowers for Holder and other first responders killed in the line of duty at the south reflecting pool is "a small gesture but at a place that is appropriate to remember."