Archewell’s homepage had a black drop with the words “In Memoriam, September 11, 2001” at the top.
Rows of the names of victims were listed in memory of the tragedy which shook the world.
Her statement said: “As we mark the 20th anniversary of the terrible attacks on September 11 2001, my thoughts and prayers — and those of my family and the entire nation — remain with the victims, survivors and families affected, as well as the first responders and rescue workers called to duty.”
In her message, she recalled her own visit to the World Trade Center more than a decade ago.
She said: “My visit to the site of the World Trade Center in 2010 is held fast in my memory.
“It reminds me that as we honour those from many nations, faiths and backgrounds who lost their lives, we also pay tribute to the resilience and determination of the communities who joined together to rebuild.”
The tragedy resulted in the deaths of nearly 3,000 people, including 67 Britons, when al Qaeda terrorists hijacked flights including two planes which plunged into the World Trade Center in New York.
A third plane smashed into the Pentagon, just outside Washington DC and a fourth plane crash landed in a field in Pennsylvania after passengers fought back against the terrorists.
“We learned that unity is the one thing that must never break,” he added.