"On the anniversary of the terrorist attacks on the United States we in Poland remember the victims and those who risked their lives to save the lives of others," Sikorski wrote on X.
"The threat continues and comes in many forms—lone wolfs, organised groups and state sponsored wars," he added.
"We must face them together. Unity is our best weapon against terror," Sikorski said.
Polish military remembers
The General Staff of the Polish Armed Forces also paid tribute, writing: "Today we commemorate an event that forever changed the world—the attack on the World Trade Center. It’s been 24 years and it’s still difficult to find words that can express the enormity of pain, loss and uncertainty that day brought.
"September 11 is also the day when we remember the importance of human solidarity. It was then that millions of people around the world united in compassion and support for the victims and their families.
"Today, our thoughts are with those who lost loved ones and with those who risked their lives to help. It is a moment of reflection, but also a reminder that in the face of tragedy, we can come together."
Nearly 3,000 people, including six Poles, were killed when hijacked planes slammed into the twin towers of the World Trade Center, the Pentagon and a field near Shanksville, Pennsylvania, 24 years ago in the deadliest terror attack on US soil.
As America marks the anniversary, hundreds of survivors and relatives of the victims are expected to gather at Ground Zero in New York, where the twin towers once stood before being brought down by two hijacked commercial flights.
Tributes are also scheduled in Arlington, Virginia, and in Shanksville, near where United Airlines Flight 93 crashed after passengers tried to regain control from al-Qaida hijackers.
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Source: IAR, PAP