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Boston Bombing Details Emerge, But Still No Suspects

/ CBS Minnesota

MINNEAPOLIS (WCCO) -- It's unclear who set off the Boston Marathon bombs. But what has become clear is how the bombs were made.

The FBI says pressure cookers were filled with BBs, ball bearings, and nails. And when they detonated, they sent shrapnel everywhere.

"A lot of injuries," one Boston doctor said. "They are numerous. Numerous. There are people who have 10, 20, 30, 40 of them in their body."

The Department of Homeland Security warned of pressure cooker bombs in 2004. It's a technique commonly taught in Afghan terrorist training camps.

But questions remain as to whether this was the work of a group or a lone wolf, and if those guilty are foreign or domestic.

"We are asking anyone with information ... to call us," the FBI's Richard Deslauriers said. "Someone knows who did his."

On Tuesday, 29-year-old restaurant manager Krystle Campbell was identified as one of the three people killed. She was watching her boyfriend cross the finish line.

Martin Richard, 8, was also killed -- he was with his mom and sister watching his dad run. Many left flowers and candles at the family's home.

Classmate Alejandro Calderon was among them.

"He used to try and make a sad moment into a funny moment," Calderon said. "And he used to work and make everybody happy again."

Martin's father, Bill, released a statement on behalf of the family saying, "We thank those we know, and those we have never met, for their thoughts and prayers."

Martin's mother also suffered a serious head injury in the explosion. And his 7-year-old sister lost one of her legs.

The third person killed has been identified as a graduate student from Boston University, but a name has not been released.

The FBI says no one has claimed responsibility for the attacks, and it is asking the public to pass along any and all information related to the attack.

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