US President Donald Trump and First Lady Melania Trump are visiting a memorial in Pennsylvania to mark the 9/11 attacks 17 years ago.
According to BBC News, Mr. Trump will deliver a speech commemorating the airplane passengers who are thought to have charged the cockpit to stop the attackers.
Ceremonies are also being held at the 9/11 Memorial plaza on the World Trade Center site in New York City.
It was deadliest foreign attack ever on US soil, killing 2,996 people.
Taiwan National Day Celebration