Toronto —
Warning: This story contains images that may be disturbing to some.

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It’s been 20 years since the September 11, 2001, airplanes were flown at the World Trade Center in New York and the Pentagon in Washington, a series of attacks that changed the world as we know it.

Americans and Canadians alike are considering the sacrifices made by firefighters, police and other first responders who rushed to the scene to help.

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They are also remembering how volunteers in Gander, NL, and its neighboring towns stepped in to help the passengers of the planes that had been taken to Canada as news of the attacks spread.

Here are some pictures that were taken after the 9/11 terrorist attacks.

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Smoke rises from buildings in Manhattan, seen from Brooklyn, after the collapse of the World Trade Center in New York, Tuesday, Sept. 11, 2001. (AP photo/Kathy Willens)

A firefighter walks through a pile of rubble

A firefighter walks through a pile of rubble at the site of the World Trade Center in New York Tuesday, September 11, 2001. (AP Photo/Graham Morrison)

People fleeing the scene near the World Trade Center

People flee near the World Trade Center in New York, Tuesday, September 11, 2001. (AP photo/Diane Bondareff)

Pedestrians in Lower Manhattan on 9/11

Pedestrians in lower Manhattan watch smoke rise from the World Trade Center in New York on Tuesday, September 11, 2001. (AP photo/Amy Sancetta)

Pedestrians flee the World Trade Center site

Pedestrians flee the area of ​​the World Trade Center in New York in lower Manhattan on Tuesday, September 11, 2001. (AP photo/Amy Sancetta)

Firefighter taken from the World Trade Center

A firefighter screams in pain after both towers of the World Trade Center in New York collapsed on Tuesday, September 11, 2001.

Flames and smoke in a Pentagon building

Flames and smoke rise from a Pentagon building on Tuesday, September 11, 2001 in Washington. (AP photo/Will Morris)

Two women hold each other in the World Trade Center

Two women hold each other as they watch the burning of the World Trade Center in New York, Tuesday, September 11, 2001. (AP Photo / Ernesto Mora)

Remains of the World Trade Center

The remains of the World Trade Center stand among the rubble in New York, Tuesday, September 11, 2001. (AP photo/Alexandre Fuchs)

people cover their faces while running

People cover their faces to protect themselves from the collapse of the World Trade Center in New York on September 11, 2001. (AP Photo/Suzanne Plunkett)

Stranded Passengers Gander, NL.  I wake up

Stranded passengers begin to wake up at the gymnasium of Gander Academy, an elementary school, in Gander, NL, on Thursday morning, September 13, 2001. Canadian Press/Scott Cook

Gander, NL.  stranded passengers

Stranded passengers email friends and relatives at Gander Academy, a Gander, NL, elementary school on September 13, 2001. Canadian Press/Scott Cook