There are no words—so here are pictures:

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firefighters at work A plane explodes after hitting the second tower of the World Trade Center as the other tower burns in New York September 11, 2001 with the Brooklyn bridge in the foreground. Both towers of the complex collapsed after hijacked planes hit them. (REUTERS/Sara K. Schwittek
firefighters at work This series of photographs shows hijacked United Airlines Flight 175 as it approaches (upper L) and impacts the World Trade Center's south tower (L), bursting into flames and raining a hail of debris on lower Manhattan September 11, 2001. A gaping hole in the north tower (R) can be seen following a similar attack earlier in the day. (Sean Adair/Reuters)
firefighters at work Firefighters head up into the building while office workers evacuate. (anonymous)
firefighters at work Firefighters head up into the building while office workers evacuate. (anonymous)
firefighters at work A firefighter rests on the bumper of his firetruck as he pauses while working at the site of the World Trade Center collapse Thursday, Sept. 13, 2001. Thousands remain missing in the rubble after the terrorist attacks on Tuesday. (AP Photo/Amy Sancetta)
police at work New York police on patrol in the World Trade Center Complex, Thursday, Sept. 13, 2001, pass the ruins of the World Trade Center's Building 7, center, in New York. It collapsed Tuesday as a result of structural problems from the terrorist attack on the World Trade Center's Twin Towers. (AP Photo/The New York Times, Jim Estrin, Pool)
police at work A police officer stands guard at a barricade outside the Empire State Building in New York on Wednesday, Sept. 12, 2001, a day after the suspected terrorist attack on the World Trade Center. Streets, a block east and west of the high profile building, were closed to pedestrian and vehicle traffic. (AP Photo/Amy Sancetta)
firefighters at work Firefighters raise a flag late in the afternoon Tuesday in the wreckage of the World Trade Center towers (Thomas Franklin/The Record/AP)
firefighters at work Firefighters leave the scene of the World Trade Center disaster as rescue operations continue, in New York September 13, 2001. A total of 4,763 people are reported missing so far in the World Trade Center catastrophe, officials said. (Shannon Stapleton/Reuters)
firefighters at work A New York City firefighter looks up September 13, 2001 at what remains of the World Trade Center after its collapse following a terrorist attack. Picture released September 17. REUTERS/HO/U.S. Navy Photo by Photographer's Mate 2nd Class Jim Watson
firefighters at work Firefighters and emergency personnel remove debris from the site of the World Trade Center towers' collapse in New York, Thursday, Sept. 13, 2001. (AP Photo/Stephen Chernin)
firefighters at work Rescue workers dig through the rubble at the base of the World Trade Center Thursday, Sept. 13, 2001, as they search for survivors and victims. They found nothing at this spot. (AP Photo/Stephen Chernin)
firefighters at work Firemen, lower left, climb over the rubble of the World Trade Center as rescue operations continue in New York September 12, 2001. New York Mayor Rudolph Giuliani said that 4,763 people are counted as missing from the attack. (Shannon Stapleton/Reuters)
firefighters at work A firefighter rests her chin on a helmet during a break as she watches the cleanup of the World Tade Center attacks, Thursday, Sept. 13, 2001 in New York. (AP Photo/Suzanne Plunkett)
firefighters at work New York City Fire Lt. Richard Johnson from Engine 88 takes a breather after working at the World Trade Center disaster, Wednesday, Sept. 12, 2001. The 110-story twin towers were leveled Tuesday morning when terrorists flew two hijacked airliners into them. (AP Photo/Ron Frehm)
firefighters at work Exhausted firefighters hitch a ride in the back of a pickup truck after their shift at the World Trade Center disaster Wednesday, Sept. 12, 2001. Terrorists flew two hijacked airliners into the 110-story twin towers, leveling the New York landmark, killing thousands, including several hundred New York City firefighters. (AP Photo/Ron Frehm)
firefighters at work Crews of firefighters, rescue workers and volunteers work in a portion of the collapsed remains of World Trade Center in New York September 14, 2001. The World Trade Center towers were destroyed after being struck by two planes in a terrorist attack on September 11. (REUTERS/Mike Segar)
firefighters at work Crews of firefighters, rescue workers and volunteers gather near a portion of the collapsed remains of World Trade Center in New York September 14, 2001. The World Trade Center towers were destroyed after being struck by two planes in a terrorist attack on September 11. (REUTERS/Mike Segar)
firefighters at work Crews of firefighters walk on debris from the collapse of the World Trade Center as they inspect the roof of One World Financial Center which stands directly accross West Street from where the World Trade Center collapsed, in New York September 14, 2001. The World Trade Center towers were destroyed after being struck by two planes in a terrorist attack on Spetember 11. (REUTERS/Mike Segar)
firefighters at work Couple stops to look at firefighter's jacket left on the gates of the U.S. embassy in Ottawa, for the victims of the attacks on the United States, September 14, 2001. The World Trade Center was destroyed when two hijacked airliners were crashed into the twin towers on September 11. (REUTERS/Jim Young)
firefighters at work Rescue workers stand on the top of the remains of the World Trade Center as they continue to look for survivors in New York September 14, 2001. The World Trade Center towers collapsed September 11 after being attacked with hijacked commercial airliners. (REUTERS/Shannon Stapleton)
firefighters at work Firefighters work beneath the destroyed mullions, the vertical struts, of the World Trade Center's twin towers after a terrorist attack in New York Tuesday, Sept. 11, 2001. As workers cleared some of the rubble, new crews of firefighters and rescue workers charged into the devastation with shovels, pickaxes and flashlights to look for bodies or survivors. (AP Photo/Mark Lennihan)
firefighters at work Firefighters make their way into the destruction to begin the search for survivors. (James Nachtwey/TIME)
firefighters at work Firefighters pay out hoses to combat the fires burning all around them. (James Nachtwey/TIME)
firefighters at work Firefighters reach for oxygen tanks which will enable them to work in the smoke-laden site. (James Nachtwey/TIME)
firefighters at work Firefighters work in the rubble of the World Trade Center towers in New York, Wednesday, Sept. 12, 2001. The towers collapsed Tuesday after being struck by two commercial aircrafts in a terrorist attack. (AP Photo/Virgil Case)
firefighters at work Firefighters survey the area of one of the atriums near the World Trade Center following the terrorist attack on the building in New York, Tuesday, Sept. 11, 2001. (AP Photo/Alex Fuchs)
firefighters at work Firefighters make their way through the blown out facade of a World Financial Center building as they head in the direction of the destroyed towers of New York's World Trade Center, following a terrorist attack that leveled the twin towers in lower Manhattan, Tuesday, Sept. 11, 2001. (AP Photo/Alex Fuchs)
firefighters at work Firefighters and other rescue personnel rest atop the ruins of a car beside the destroyed mullions, the vertical struts which once faced the soaring outer walls of the World Trade Center towers, after a terrorist attack on the twin towers of lower Manhattan Tuesday, Sept. 11, 2001. As workers cleared some of the rubble, new crews of firefighters and rescue workers charged into the devastation with shovels, pickaxes and flashlights to look for bodies or survivors.(AP Photo/Mark Lennihan)
firefighters at work Firefighters comb the remains of the World Trade Center after a terrorist attack September 11, 2001. Two hijacked commercial planes slammed into the twin towers of the World Trade Center Tuesday, causing both 110-story landmarks to collapse in thunderous clouds of fire and smoke and killing a "tremendous number" of people. (REUTERS/Peter Morgan)
firefighters at work Firefighters make their way through the rubble of the World Trade Center in New York after two hijacked planes flew into the landmark skyscrapers. (AFP/Doug Kanter)
firefighters at work Rescue workers remove a man from the World Trade Center tower in New York City early September 11, 2001. Both towers were hit by planes crashing into the building. Victims of the attack many suffering from extensive burns began arriving at hospitals in New York City about an hour after two planes slammed into the twin towers. (REUTERS/Shannon Stapleton)
firefighters at work Firemen carry an injured man from the World Trade Center after both towers collapsed. (Reuters/Peter Morgan)
firefighters at work Firefighters make their way through rubble of the World Trade Center. (AP/Shawn Baldwin)
firefighters at work Firefighters hose down the wreckage of the World Trade Center towers in the early morning hours Sunday, Sept. 16, 2001, at the site of Tuesday's terrorist attack in New York. With each passing hour, the men and women who comb the wreckage grow more frustrated, as their hope of finding survivors is dashed at every turn. (AP Photo/J. Jason Warner)
firefighters at work Firefighters hose down the wreckage of World Trade Center Building 7, Sunday, Sept. 16, 2001, at the site of Tuesday's terrorist attack in New York. With each passing hour, the men and women who comb the wreckage grow more frustrated, as their hope of finding survivors is dashed at every turn. (AP Photo/Lawrence Jackson)
firefighters at work Firefighters continue to douse small fires in the rubble of the World Trade Center in New York, Monday, Sept. 17, 2001, six days after the worst terrorist attack in American history leveled the buildings. (AP Photo/Ed Betz)
firefighters at work A group of firefighters is applauded by traders as they pass through the floor of the New York Stock Exchange Monday, Sept. 17, 2001. The stock market opened for the first day since the Tuesday's terrorist attack on the World Trade Center. (AP Photo/Beth A. Keiser)
firefighters at work Work crews lift a fire truck from the debris of the collapsed World Trade Center in Lower Manhattan on Saturday evening, Sept. 15, 2001. Hundreds of firefighters who tried to save thousands trapped in the center's two towers following a terrorist attack are missing in the rubble. (AP Photo/Charles Krupa)
police at work A New York City police officer clears people off Wall St. in New York Sunday, Sept. 16, 2001, as preparations continue for opening the stock markets Monday morning. The markets have been closed since last Tuesday's terrorist attack against the World Trade Center. (AP Photo/Bob Bukaty)
banner Workers hang a banner honoring World Trade Center rescue workers from the roof of a building next to the World Trade Center attack site Wednesday, Sept. 19, 2001 in New York. (AP Photo/Ted S. Warren)
soldiers The twisted wreckage of the World Trade Center looms in the background as National Guard soldiers patrol the perimeter in lower Manhattan early Tuesday, Sept. 18, 2001. Rescue workers continue a non-stop search for more than 5,000 persons missing after last Tuesday's terrorist attack . (AP Photo/Ron Frehm)
firefighters at work A New York City fireman calls for 10 more rescue workers to make their way into the rubble of the World Trade Center, Saturday Sept 15, 2001. (AP Photos/U.S. Navy, Journalist 1st Class Preston Keres)
police Police and rescue workers wait near the wreckage of the World Trade Center in New York, late Sunday, Sept. 16, 2001. With hopes fading on Sunday that any more survivors would be found amid the dust, steam and gore that is now the World Trade Center, Mayor Rudolph Giuliani urged New Yorkers not to cower before terrorism. (AP Photo/Shawn Baldwin)

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