Organizers are inviting everyone to attend the free event to honor "those who have sacrificed their lives for others."
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Police said there are no known threats, but want people to be aware of their surroundings and look out for anything that may seem out of the ordinary.
Students and staff gathered near Grawemeyer Hall for a moment of silence and remembrance.
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Maj. Bobby Cooper says 9/11 is a special, bittersweet day for firefighters across the country.
The Stars and Stripes Gala is a veteran's charity event that helps veterans find homes and jobs.