President Donald Trump said Monday that America can honor the lives lost in the deadliest terrorist attack in US history on September 11, 2001, by resolving to keep its people safe.
"The terrorists who attacked us thought they could incite fear and weaken our spirit", he said.
Secretary of Defense James Mattis and Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford will host the ceremony honoring the 184 people killed in the attack at the Pentagon.
"In that hour of darkness we. came together with renewed objective our differences never looked so small, our common bonds never felt so strong", he said.
"On that day not only did the world change, we all changed". Our differences never looked so small.
It came on a day when emergency medical workers were engaged in rescue and recovery efforts in Florida and the Gulf Coast in Texas to deal with aftermath of Hurricanes Irma and Harvey, two huge storms that have stretched the resources of federal emergency management officials also responsible for protecting the nation from terrorist attacks.
Before traveling to the Pentagon, Trump and the First Lady observed a moment of silence at the White House.
The remembrance is scheduled for about the time the first plane struck one of the Twin Towers on the morning of September 11, 2001.
In Jerusalem, an estimated 500 people gathered at the Jewish National Fund's "Living Memorial" on Monday morning local time for the USA embassy's official 9/11 remembrance service.
Vice President Mike Pence travelled to Shanksville, Pennsylvania, where one of the four hijacked jetliners crashed after passengers overpowered the hijackers.
"We rededicate ourselves to the ideals that define our country and unite us as one, as we commemorate all the heroes who lost their lives saving others", said Trump in a statement.