Kiwis and NZ-based Americans will gather today to mark the 15th anniversary of the 9/11 terror attacks - and pay honour to the lives lost in the heinous acts which shocked the world.
Almost 3000 people lost their lives - including more than 400 police officers and firefighters - during four coordinated terrorist attacks in New York and Washington D.C in 2001.
The catastrophic events led to the War on Terror, the American-led international effort to fight terrorism.
New Zealand firefighters will be the first in the world to hold a memorial event, when more than 160 firefighters from across New Zealand climbing the Sky Tower's 1,103 stairs at 1.30pm.
The Memorial Firefighter Stair Climb will honour those lost in the line of duty in 2010, with names of the dead featuring on tags being taken to the top of the Sky Tower.