New York commemorates 25 years since 9/11, with Trump absent from Ground Zero and right-wing criticism of Muslim Mayor Zohran Mamdani.

New York commemorates the 25th anniversary of the devastating September 11, 2001 attacks Friday with a ceremony marked by US President Donald Trump's absence and right-wing outrage at the attendance of the city's first Muslim mayor.

Trump will pay his respects at the Pentagon, not New York, where hijacked planes destroyed the World Trade Center and killed most of the 2,977 total victims on that world-altering day.

Vice President JD Vance and Trump's four living predecessors -- Republican George W. Bush, who was in office during the attacks, and Democrats Joe Biden, Barack Obama and Bill Clinton -- are all expected at the "Ground Zero" site in lower Manhattan.

No one will give speeches at the ceremony, while bereaved family members will read out the names of all of those killed and a bell rung to mark major moments during the attack.