U.S marks 15th anniversary of 9/11 attacks
More that 70, 000 others live with mental and physical illnesses as a result of the attacks
Today, United States of America marks the 15th anniversary of the worst terrorist attack in the history of the country, the 9/11 attacks.
The September 11, 2001 attacks were a series of four coordinated terrorist attacks by the Islamic terrorist group, al-Qaeda on the United States on the morning of September 11, 2001.
The attacks killed 2,996 people and injured over 6,000 others and caused at least $10 billion in property and infrastructure damage and $3 trillion in total costs. The remains of only 1,640 people have been identified.
More that 70, 000 others live with mental and physical illnesses as a result of the attacks, many of them emergency workers who breathed in cancerous toxins as they valiantly tried to save lives.
The US President Barack Obama on the eve of the anniversary hailed the values and resilience that he says both define and sustains Americans.
Obama, in his weekly radio and internet address, also hailed the bravery of survivors and the emergency personnel who responded, and the work of scores of others who have worked since to keep the US safe.
"In the face of terrorism, how we respond matters ... We cannot give in to those who would divide us. We cannot react in ways that erode the fabric of our society," he said.
The attackers' goal was to frighten Americans into changing how they live, Obama said, adding: "Americans will never give in to fear."
"We're still the America of heroes who ran into harm's way, of ordinary folks who took down the hijackers, of families who turned their pain into hope," Obama said.
Osama bin Laden, leader of Al-Qaeda who mastermind the attack, was killed nearly a decade later by US forces during a May 2011 raid on his Pakistani hideout that Obama authorised.