The series of four coordinated terrorist attacks by the militant Islamist terrorist group al-Qaeda killed almost 3,000 people.

Two of the planes were flown into the twin towers of the World Trade Center in New York City, a third plane hit the Pentagon just outside Washington, D.C., and the fourth plane crashed in a field in Shanksville, Pennsylvania.

To commemorate those who lost their lives, families and friends in the tragedy, you can visit a dedicated memorial site in London.

The Queen Elizabeth Olympic Park memorial site was installed permanently on March 17, 2015 after having been displayed in Battersea Park since September 2011.

The 'After 9/11' sculpture was created by Miya Ando, using World Trade Center fragments gifted to the UK by the Port Authority of New York and New Jersey in 2010.

The steel girders erected vertically honors 9/11 victims, including the 67 British victims.

Artist Miya Ando polished a plate of World Trade Center steel, attached to girders, to reveal a shiny, reflective surface.

There is also a section of twisted and rusted steelwork lifted from the ruins of the World Trade Center on display at IWM London.

The piece comprises beams from the external walls of the building, and was originally located somewhere around one of the two impact zones.

Were you or any family members in New York at the time of the attacks on the Twin Towers?

Were you part of the emergency teams which dealt with the aftermath?

Were you affected in any way by events on that terrible day?

Let us know in the box below.