As the nation remembered one of its darkest days, so too did the professional sports teams and influential athletes who call Denver home.

Sunday marked 15 years since the attacks on the World Trade Center in New York, the Pentagon and the failed attack on Washington D.C. that left nearly 3,000 victims dead. Touched by the memory of that very difficult day, voices from across the Denver sports landscape took to social media to honor those lost on Sept. 11, 2001 and those who continue to fight in the ongoing war against terrorism.

We’ve assembled some of the top posts from the teams and players paying tribute to those who lost their lives and to those who put theirs at risk in the name of freedom.

The Broncos shared this video from the City of Denver’s 9/11 tribute…

Rapids goaltender Tim Howard, who played for the New York/New Jersey Metrostars in 2001, shared this powerful image of the Twin Towers and the Statue of Liberty.

Broncos head coach Gary Kubiak was in attendance at “Big Bill’s 9/11 Day of Giving” hosted by Big Bill’s New York Pizza in Southglenn.

Von Miller shared this video, from the #FootballisAmerica campaign…

Derek Wolfe was understated but sincere in his thoughts…

Defensive captain DeMarcus Ware shared President Obama’s message of remembrance carried on NFL broadcasts…

The Rockies shared MLB’s memorial graphic of remembrance…

Rockies reliever Jason Motte shared this powerful image…

The Rockies posted this photo of the custom bases in use for Sunday’s game…

Rockies players stood alongside veterans and first responders in San Diego in remembrance of those who were lost and in honor of those who fought and continue to fight…

The Nuggets shared this image from the Ground Zero memorial…

Matt Duchene, a Canadian, honored America with this post…

The Rapids shared this photo of the flag and a message of remembrance…

Colorado State football paid their tribute with a “United We Stand” message…