Ahead of the 20th anniversary of the 9/11, "Boardwalk Empire" star Steve Buscemi is opening up about his post-traumatic stress from volunteering with the New York City Fire Department that fateful day. "Post-traumatic stress? Absolutely," Buscemi said on Marc Maron's "WTF" podcast Thursday.

The 63-year-old actor served as a New York City firefighter in Manhattan's Little Italy neighborhood from 1980 to 1984 before turning to acting. Buscemi returned to volunteer with his old Engine Company No. 55 following the 2001 terrorist attacks to assist in search and recovery efforts at the World Trade Center.