Last Sunday was the 15th anniversary of 9/11, the deadliest attack on American soil. More than 6,000 people were injured and 2,996 people perished in the attacks, including 71 law enforcement officers and 343 firefighters.

The attacks on the World Trade Center started at 8:45 a.m when a Boeing 767 crashed into the North Tower. Eighteen minutes after the crash on the North Tower, a second Boeing 767 crashed into the South Tower. The collisions caused explosions in both towers, sending burning debris to the streets of New York City. At 9:59 a.m, the South Tower collapsed, along with the North Tower 29 minutes afterwards, causing a total of 2,606 civilians and emergency responders to perish.

Almost 20 minutes before the South Tower collapsed, a Boeing 757 crashed into the west side of the Pentagon in Washington, D.C., killing everyone on board the plane, as well as 125 military personnel and civilians.

A little after 10 a.m, another Boeing 757 was headed towards Washington, D.C, when the passengers and crew members on board attempted to retake the plane from the hijackers, causing the plane to crash into a field in Pennsylvania, causing all aboard to be killed upon impact.

Take a moment to remember this time and how America has become more unified since that day.