Knoxville — Tuesday marks 17 years since the deadly terrorist attacks on the World Trade Center in New York City.

In East Tennessee, volunteers participated in the memorial stair climb at World's Fair Park.

EMS, police officers, firefighters and other emergency personnel geared up to replicate the journey that the brave crews made that day, as well as anyone who donated $30 to participate alongside them.

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They climbed the equivalent of 110 stories up the Sunsphere in downtown Knoxville.

343 people made the climb, each wearing a badge with a photograph of someone who died giving their life on 9/11.

This is the 5th year for the event and all proceeds donated will go to help the National Fallen Firefighters Foundation. The organization provides assistance to the surviving families and co-workers of the 343 firefighters who made the ultimate sacrifice on September 11, 2001.

You can learn more about the climb here.

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