Mourning, resolve and quest for answers after deadly Boston Marathon bombs

Updated 7:18 AM EDT, Wed April 17, 2013

Story highlights

NEW: Photos shows parts of a pressure cooker, backpack and pellets

An 8-year-old boy, 29-year-old woman and grad student from China die

Scores more are injured in the twin blasts, helped by medical staff and others

Authorities say they don't have any suspects or a motive for the attack

(CNN) —  

A 29-year-old woman, remembered by her mother for her “heart of gold.” A Boston University graduate student from China who’d gone to enjoy the marathon’s finish with two classmates. An 8-year-old boy, cheering on runners with his family.

All of them, gone.

Their lives were snuffed out by twin blasts at the tail end of Monday’s Boston Marathon. Thirteen others – out of 183 hospitalized – had limbs amputated, according to hospital officials. The question is: Why?

The victims: Promising lives lost in tragedy

More than a day later, authorities don’t have an answer. Unlike after the September 11, 2001, attacks, no one claimed responsibility for this terrorist attack. No one had been identified as a suspect. The attack came out of nowhere, with no threat. Just horror.

As Richard DesLauriers, the special agent in charge of the FBI’s Boston office, put it Tuesday afternoon: “The range of suspects and motives remains wide open.”