PHILADELPHIA (WPVI) -- A solemn procession took place through the streets of Old City on Thursday morning, the 24th anniversary of the September 11th terrorist attacks.

Dozens of police officers and firefighters walked from the Fireman's Hall Museum on North 2nd Street to the Betsy Ross House on Arch Street. They followed behind city leaders, including Mayor Cherelle Parker, Police Commissioner Keven Bethel and Fire Commissioner Jeffrey Thompson.

"Twenty-four years ago today, our country changed forever," said Mayor Parker.

The first responders who gathered in the courtyard of the Betsy Ross house couldn't help but think of their brethren who ran into harm's way at the World Trade Center.

"Heroism comes in many forms. Uniform or not," said Bethel.

The ceremony included bell tolls in

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