Fourteen years on from the tragic events of September 11th 2001, steel beams salvaged from the demolished World Trade Center have been added to a memorial in Rockford, Illinois.

On the anniversary of the attack, a ceremony took place at the Winnebago County Emergency Responders Memorial, the Associated Press reports.

Two steel beams, weighing 1,000 pounds (450 kg), were delivered to Winnebago County in March 2011 by the Port Authority of New York and New Jersey.

Now, some four and a half years later, they have finally taken their place as part of the memorial to those who respond to such incidents, putting themselves in danger to protect the safety of others.

It is a particularly industrial reminder of the buildings that fell on September 11th 2001, and many memorials to the events of that day incorporate sections of the original structural steel from the World Trade Center.

Meanwhile, ongoing construction work has raised the new One World Trade Center to roof level, and it was officially opened on November 3rd 2014.

The tower – whose construction was documented in an EarthCam time lapse video as we reported earlier this month – is a symbol of resilience and strength, both metaphorically and in the very real physical strength of its structural steel columns.