President Obama spoke this morning at the dedication of the 9/11 Museum in lower Manhattan. He recounted the story of 24-year-old Welles Crowther, who worked in the South Tower and died in the 9/11 attacks.

Crowther, a volunteer firefighter known for wearing a red bandana, helped others to safety on that morning. His mother learned of his heroism in a news story after 9/11 in which survivors spoke of a man in a red bandana.

"After the planes hit, he put on that bandana and spent his final moments saving others," said Obama.

Watch the president's remarks in the video above.

In the clip below, watch remarks from Welles' mother, Alison Crowther, and Ling Young, who credits Welles with saving her life on 9/11.