The 10th annual 9/11 Memorial Stair Climb will take place Saturday, Sept. 10 at Lambeau Field. 

It is a tribute to the 343 New York City Fire Department members who gave their lives during the tragic events at the World Trade Center on Sept. 11, 2001.

Annual Memorial stair climb is just a small way to honor the members of the fire service who were lost that day.

What happened on 9/11?

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9/11

"9/11" refers to four coordinated attacks in the morning of September 11, 2001 perpetrated by al-Qaeda, an Islamist extremist group.

Al-Qaeda hijacked four commercial airplanes, deliberately crashing two of them into the North and South Towers of the World Trade Center complex and one into the Pentagon in Arlington, Virginia.

Due to the impact damage and subsequent fires, the Twin Towers ultimately collapsed.

Four hijacked planes carried out a series of attacks between Washington and Eastern Pennsylvania, and Flight 93 participated in one of them. It crashed into an empty field about twenty minutes from Washington.

2,977 people were killed in the attacks from 93 nations: 2,753 in New York, 184 at the Pentagon, and 40 on Flight 93.

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