The beaming art installation, assembled on a roof south of the memorial, is comprised of 88 search lights positioned into two 48-foot squares, echoing the shape and orientation of the twin towers.
When he arrived at the Pentagon, he was greeted by Defense Secretary Mark Esper.
US Ambassador to Israel David Friedman gives a speech during a ceremony commemorating the 9/11 terror attacks in New York City, at the 9/11 Living Memorial Plaza in Jerusalem on September 10, 2019.
Near Shanksville, Pennsylvania, the third site where planes crashed on September 11, 2001, Vice President Mike Pence credited the crew and passengers who fought back against the hijackers with protecting him and others in the US Capitol that day. He says he wished he got to know his uncle and that he's "honored to be named after you".
"As we honor and remember all those who died on 9/11 and their families, let us not forget the first responders who have died since 9/11 and their families", Maureen Pulia said after reading names at ground zero.
At ground zero in NY, victims' relatives and dignitaries were gathered on the memorial plaza at the World Trade Center in NY as the ceremony started at 8:46 a.m. Wednesday.
It has been 18 years since al-Qaida hijackers commandeered four USA commercial airliners and crashed them into the World Trade Center, the Pentagon and a field in Shanksville, Pennsylvania. Like Presidents Barack Obama and George W. Bush, Trump is marking the day with the war still raging.
Eighteen years after the deadliest terror attack on American soil, the nation is still grappling with the aftermath at ground zero, in Congress and beyond. Those who spoke today say they're glad to see so many people still remembering 9/11 victims.
While research continues into whether those illnesses are tied to 9/11 toxins, a victims compensation fund for people with potentially September 11-related health problems has awarded more than $5.5 billion United States so far.
September 11, 2001 changed the face of the USA and and left almost 3,000 dead at the World Trade Center, the Pentagon, and in Pennsylvania where Flight 93 was forced to crash.
Almost 3,000 people were killed that day and thousands more were injured.
After years of legislative gridlock, dwindling money in the fund and fervent activism by ailing first responders and their advocates, Congress this summer made sure the fund won't run dry.
Many of those killed in the attacks were first responders who attempted to save lives.
A crowd of victims' relatives is expected at ground zero Wednesday.
September 11 is known not only as a day for remembrance and patriotism, but also as a day of service. People around the country continue to volunteer at food banks, schools, home-building projects, park cleanups and other charitable endeavours on and near the anniversary.