People gather in Foley Square during a vigil for the victims of the West Side Highway pickup attack, in Manhattan, New York, Nov 1, 2017. [Photo/Agencies]

NEW YORK - New York Marathon organisers revealed late on Tuesday that some media events have been postponed following Tuesday's terrorist attack in Manhattan, but all other races will continue as planned.

"With respect to the victims and their families, we will be postponing our ceremonial Blue Line Painting and Faces of the Marathon media events originally scheduled for Wednesday," the organisers said in a statement.

"We are monitoring the situation closely with our city, state, and federal agency partners, particularly the NYPD. For this weekend's marathon, as with all of our events, the safety and security of our runners, staff, volunteers, and spectators is our top priority," the statement said.

"We have extensive safety and security measures in place, both visible and behind the scenes. We are constantly reviewing our plans with law enforcement and will consider any necessary modifications or enhancements."

An estimated 50,000 runners are expected to run Sunday's race, which begins on Staten Island and winds through all five boroughs.