A television writer and producer, Caroline Dries, captured the horrific scene while she was a student.

Dries was studying at New York University at the time of the incident and took the video from her dorm room.

Caroline and her roommate woke up just before 9 AM to the sound of an explosion — the first plane hitting the Tower.

Though she didn't know what was happening, she grabbed the camera and started filming the scene.

A few minutes later, the second plane hit the Tower. The women then left their dorm, while one of them stated:

"I don't want to be on the 32nd floor of this building anymore."

After graduating, Caroline became a successful television producer who worked on hit shows like Smallville and The Vampire Diaries.

Warning: This Video Contains Graphic Images That May Be Disturbing To Some Viewers!

19 years ago, America experienced the deadliest attacks on US soil since the Pearl Harbor bombing during WWII.

Nearly 3,000 people died in the 9/11 attacks, which The New York Times called the 'worst and most audacious terror attack in American history.'

And the nation is still healing and working to move past this tragedy, which left the world in shock.

So, what happened on 9/11, 19 years ago?

The morning of September 11, 2001, started off like any other. And the Twin Towers stood tall in the Financial District, as they had for more than 30 years.

However, terrorists hijacked four passenger airliners, planning an attack on US soil.

At 8:46 AM, one of the hijacked planes, American Flight 11, crashed into the North Tower of the World Trade Center.

At first, newscasters weren't sure whether it was an accident or a deliberate attack.

About 16 minutes later, at 9:03AM, the second plane, United Flight 175, crashed into the South Tower.

This left no doubt that this was an attack.

The second plane exploded upon impact, caused by the ignition of jet fuel. And both buildings started blazing.

Then, at 9:40 AM, the third plane, American Flight 77, crashed into the Pentagon.

At 9:59 AM, the South Tower collapsed.

At 10:03 AM, the fourth hijacked flight, United Flight 93, crashed into a field in Shanksville, Pennsylvania.

The plane's target was believed to be the US Capitol.

The passengers on board tried to gain control of the plane and divert the hijackers after learning of the other attacks.

At 10:28 AM, the North Tower collapsed. It took only 12 seconds for the entire Tower to fall.

Around 2,753 people died in the New York attack. That count includes 343 firefighters and paramedics and 60 cops who rushed to aid in the aftermath.

40 other people died in Pennsylvania and 184 in Washington, totaling to nearly 3,000 people.