Defence Minister Mariusz Błaszczak, in a Twitter message, commemorated “the precious lives of US and other nations’ citizens, servicewomen and men, lost 18 years ago on 9/11...”
“We'll always stay united! R.I.P. all innocent victims,” he said.
The US ambassador to Poland, Georgette Mosbacher, noted in a tweet that six Polish citizens lost their lives in the terror attacks in America on September 11, 2001.
She said: "Today, we commemorate all victims of this horrific attack, including the six Polish citizens who lost their lives."
Mosbacher added: "After the 9/11 attacks Poland stood with the United States, and we will never forget that."
At 2:46 p.m. Polish time, sirens wailed in commemoration of the anniversary at a Warsaw park that holds a monument to the Poles killed in the terror attack in New York.
Almost 3,000 people, including six Poles, died after hijacked planes slammed into the twin towers of the World Trade Center, the Pentagon, and a field near Shanksville, Pennsylvania, 18 years ago in what was the deadliest terror attack on American soil.
As America marked the 18th anniversary of the attacks, hundreds of survivors and family members of those killed on Wednesday gathered at Ground Zero, where the twin towers stood in New York before two hijacked commercial flights brought them down.
Tributes were also held in Arlington, Virginia, and in Shanksville, near where United Airlines Flight 93 crashed after passengers tried to regain control from the Al Qaeda-affiliated terrorists who had hijacked the plane.