NEW YORK (AP) — It's been another anniversary of shared memories and shared sorrow for family members of those who died in the terrorist attacks 12 years ago today.

Vicki Tureski, whose brother-in-law died at the World Trade Center, was among those who gathered today for the annual memorial service where the buildings stood. She says victims' families will continue to help each other through the years to come.

Bells tolled to mark the times when the hijacked planes hit the towers, and when they fell. As has become the tradition, family members read the names of the victims, and spoke of the impact of their loss. One woman whose mother was killed said, "As time passes and our family grows, our children remind us of you."

A ceremony in Shanksville, Pennsylvania, capped a morning of solemn observances on the 12th anniversary of the Sept. 11 attacks. Families of the passengers and crew aboard United Flight 93 recalled their loved ones as heroes who died trying to stop their hijackers from slamming the plane into the White House or Capitol.

Interior Secretary Sally Jewell said, "We never know when we'll be called to lay down our lives for others." A memorial is being built in the field southeast of Pittsburgh where the plane crashed.