Across the nation, many Americans marked the 18th anniversary of Sept. 11, 2001 terror attacks with a moment of silence and memorial services. Although years have passed, Americans are unable to forget the horror, pain, and confusion they experienced when terrorist-piloted planes crashed into the World Trade Center, the Pentagon, and on a field in Pennsylvania.
Nearly 3,000 innocent people were killed that day, including 184 lives that were taken at the Pentagon. Families are still feeling the grief from losing a loved one, while many heroic first responders are still suffering from health-related problems after being exposed to the smoke and dust at ground zero while facing imminent danger.
At the Pentagon this year, President Donald Trump remembered and praised the first responders and civilians for displaying courage and heroism, while mourning the lives that were stolen that day.
“For every American who lived through that day, the Sept. 11 attack was seared into our soul. It was a day filled with shock, horror, sorrow, and righteous fury,” Trump said.
“This is your anniversary of personal and permanent loss,” he added. “It’s the day that has replayed in your memory thousand times over. The last kiss. The last phone call. The last time hearing those precious words, ‘I love you.’”
Here are the images from America’s deadliest terrorist attack that changed the world forever.
Warning: The images may cause distress to some viewers.
The Aftermath of the World Trade Center Attack
A hijacked commercial plane crashes into the World Trade Center in New York on Sept. 11, 2001. The landmark skyscrapers were destroyed in the attack. Seth McAllister/AFP/Getty Images
The rubble of the World Trade Center smolders following a terrorist attack in New York on Sept. 11, 2001. A hijacked plane crashed into and destroyed the landmark structure. Alexandre Fuchs/AFP/Getty Images
Pedestrians run from the scene as one of the World Trade Center towers collapses in New York City following a terrorist plane crash on the twin towers on Sept. 11, 2001. Doug Kanter/AFP/Getty Images
A police officer (R) and others walk in the streets covered in debris near the World Trade Center towers in New York on Sept. 11, 2001. Two planes crashed into each building and the tops of each tower collapsed. Stan Honda/AFP/Getty Images
A wall of dust and smoke races through streets framed by St. Paul's Chapel (L) and the Astor Building (R) as the top of one of World Trade Center towers collapses after two planes crashed into the buildings in New York on Sept. 11, 2001. Stan Honda/AFP/Getty Images
Mannequins are seen on the floor of the Brooks Brothers' shop in New York near the World Trade Center after the twin towers collapsed on Sept. 11, 2001. The store has been turned into a temporary morgue. David Buttons/AFP/Getty Images
An unidentified man with a face mask walks on an ash covered street near Ground Zero after the collapse of the Twin Towers in New York City on Sept. 11, 2001. Anthony Correia/Getty Images
The twin towers of World Trade Center burn after two planes crashed into each building in New York on Sept. 11, 2001. Stand Honda/AFP/Getty Images
Smoke billows from the collapsed Building Seven in the World Trade Center complex early in New York City on Sept. 12, 2001. Firemen are putting out the remaining fires and rescuers are searching for survivors. John Mottern/AFP/Getty Images
Smoke pours from the World Trade Center in New York City after being hit by two hijacked planes on Sept. 11, 2001. Craig Allen/Getty Images
A survivor sits outside the World Trade Center after two planes hit the building in New York City on Sept. 11, 2001. Jose Jimenez/Primera Hora/Getty Images
People hang from the windows of the North Tower of the World Trade Center after a hijacked airliner hit the building in New York City on Sept. 11, 2001. Jose Jimenez/Primera Hora/Getty Images
A man falls to his death from the World Trade Center in New York City after two planes hit the building Sept. 11, 2001. Jose Jimenez/Primera Hora/Getty Images
Dust swirls around south Manhattan moments after a tower of the World Trade Center collapsed in New York City after two airplanes slammed into the twin towers in an alleged terrorist attack on Sept. 11, 2001. Spencer Platt/Getty Images
New York City firefighters look at the destroyed facade of the World Trade Center Sept. 13, 2001, two days after the twin towers were destroyed when hit by two hijacked passenger jets in a terrorist attack. Chris Hondros/Getty Images
Remnants of a New York City Fire Department vehicle lie in the wreckage of the World Trade Center in New York City on Sept. 13, 2001, two days after the twin towers were destroyed when two hit by two hijacked passenger jets. Chris Hondros/Getty Images
Smoke pours from the former site of the World Trade Center in Manhattan from a vantage point in Hoboken, New Jersey, on Sept. 13, 2001. Smoke filled the air all over lower Manhattan in the aftermath of Tuesday's terrorist attack and destruction of the World Trade Center. Chris Hondros/Getty Images
Rubble burns at the remains of the destroyed World Trade Center towers in New York City on Sept. 12, 2001, one day after the twin towers were leveled in a terrorist attack. Spencer Platt/Getty Images
The remains of a charred car lie on the side of the road in New York City on Sept. 12, 2001. A terrorist attack on the World Trade Center left the twin towers in rubble, killing thousands. Darren McCollester/Getty Images
Debris covers cars at the World Trade Center after two hijacked planes crashed into the Twin Towers in New York City on Sept. 11, 2001. Ron Agam/Getty Images
President George W. Bush (R) being informed by his chief of staff Andrew Card of the attacks on the World Trade Center in New York during an early morning school reading event in Sarasota, Florida, on Sept. 11, 2001. Paul J. Richards/AFP/Getty Images
The First Responders, Rescue Workers
A firefighter breaks down after the World Trade Center buildings collapsed after two hijacked airplanes slammed into the twin towers in a terrorist attack that killed about 3,000 people on Sept. 11, 2001. Mario Tama/Getty Images
An unidentified New York City firefighter walks away from Ground Zero after the collapse of the Twin Towers in New York City on Sept. 11, 2001. The World Trade Center's Twin Towers and the Pentagon were attacked by terrorists using commercial airliners as missiles. Anthony Correia/Getty Images
Firefighters make their way through the rubble of the World Trade Center in New York after two hijacked planes flew into the landmark skyscrapers on Sept. 11, 2001. Doug Kanter/AFP/Getty Images
A fireman runs as the World Trade Center crumbles after two planes hit the building in New York City on Sept. 11, 2001. Jose Jimenez/Primera Hora/Getty Images
New York City firefighters take a rest at the World Trade Center after two hijacked planes crashed into the Twin Towers in New York City on Sept. 11, 2001. Ron Agam/Getty Images
New York City firefighters work at the World Trade Center after two hijacked planes crashed into the Twin Towers in New York City on Sept. 11, 2001. Photo by Ron Agam/Getty Images
Fireman walk down Chambers Street on Sept. 12, 2001 towards the remains of the World Trade Center in New York City. Darren McCollester/Getty Images
New York City firefighters and a photojournalist work at the World Trade Center after two hijacked planes crashed into the Twin Towers in New York City on Sept. 11, 2001. Ron Agam/Getty Images
Police escort a civilian from the scene of the collapse of a tower of the World Trade Center in New York City on Sept. 11, 2001 after two airplanes slammed into the twin towers in a terrorist attack. Spencer Platt/Getty Images
A firefighter rests in the area where the World Trade Center buildings collapsed on Sept. 11, 2001 after two airplanes slammed into the twin towers in a terrorist attack. Mario Tama/Getty Images
Rescue workers and medical personnel try to extricate a survivor from the wreckage of the World Trade Center in New York City on Sept. 11, 2001. Rescue efforts continued two days after two airplanes slammed into the twin towers in terrorist attack, leveling them. Mario Tama/Getty Images
Policemen walk past crushed cars near the wreckage of the World Trade Center in New York City on Sept. 13, 2001. Rescue efforts continued two days after two highjacked airplanes slammed into the twin towers in a terrorist attack, leveling them. Mario Tama/Getty Images
Attack at the Pentagon
Smoke comes out from the Southwest E-ring of the Pentagon building in Arlington, Virginia, on Sept. 11, 2001, after a hijacked airplane crashed into the building and set off a huge explosion. Alex Wong/Getty Images
Smoke comes out from the Southwest E-ring of the Pentagon building in Arlington, Virginia on Sept. 11, 2001, after a plane crashed into the building and set off a huge explosion. Alex Wong/Getty Images
Smoke comes out from the west wing of the Pentagon building in Arlington, Virginia, on Sept. 11, 2001, after a plane crashed into the building and set off a huge explosion. Alex Wong/Getty Images
Emergency responders survey the damage on scene following an attack at the Pentagon in Arlington, Virginia, on Sept. 11, 2001 in this undated image. American Airlines Flight 77 was hijacked by al Qaeda terrorists who flew it in to the building, killing 184 people. Federal Bureau of Investigation via Getty Images
First responders on scene following an attack at the Pentagon in Arlington, Virginia, on Sept. 11, 2001, in this undated image. American Airlines Flight 77 was hijacked by al Qaeda terrorists who flew it into the building, killing 184 people. Federal Bureau of Investigation via Getty Images
Rescue workers and Pentagon personnel attend to the wounded outside the Pentagon after a hijacked plane crashed into the building in Washington on Sept. 11, 2001. Greg Whitesell/Getty Images
The Washington Monument stands in the background as firefighters pour water on a fire at the Pentagon that was caused by a hijacked plane crashing into the building in Washington on Sept. 11, 2001. Greg Whitesell/Getty Images
