INDIANAPOLIS (AP) – Indiana has remembered the victims of the Sept. 11, 2011, attacks with solemn memorials and acts of volunteerism.

A piece of steel recovered from the World Trade Center accompanied a firefighter’s helmet and a police officer’s hat during a ceremony Wednesday at Indianapolis International Airport. Firefighters sang the national anthem to observers, who included airport emergency responders deployed to Ground Zero.

Tributes also were held at the 9/11 memorial in downtown Indianapolis. Speakers included Don Basco of Dyer, who was at work in the World Trade Center when the attacks occurred.

Center Grove High School students volunteered at food pantries, community groups and to help elderly homeowners during an annual day of caring.

Student Jack Boksa says helping someone else on the anniversary of the attacks “makes you feel better.”

The Wall That Heals was also opened at Grandview along State Road 66 yesterday. That exhibit is set to be on display through Sunday.