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.