Families Mark Oklahoma Bombing Anniversary

More than 2,000 people gathered Sunday for a memorial service on the twentieth anniversary of the horrific 1995 Oklahoma City bombing.

Families of the bombing victims gathered at the former site of the Alfred P. Murrah Federal Building and read the names of their deceased loved ones.

Christian singer Michael W. Smith sang "How Great Thou Art," and Catholic Archbishop Paul Coakley prayed for continued healing.

"I remember her spirit and her dedication," Rosslyn Biggs said as she and other family members recalled her mother, Dr. Margaret L. "Peggy" Clark.

They joined the many families who gathered in a memorial field of empty chairs created to honor the victims of the 1995 bombing.

Some survivors expressed their resolve to succeed in life.

"I have to try my hardest in everything because I can't not give it my all," said P.J. Allen, who was a baby in daycare in the federal building when the attack occurred.

The Oklahoma City attack was carried out by anti-government extremists who detonated a massive truck bomb that day, killing 168 people and injuring 680 others.

It was the deadliest terror attack on U.S. soil, prior to the attacks on September 11, 2001.