The FBI released images Tuesday evening of the bombs used in the Boston Marathon attack.
The pieces of metal and fabric pictured were part of a device the FBI says was designed to hurt or kill as many people as possible.
According to an anonymous person close to the investigation, two bombs made of explosives in 1.6-gallon pressure cookers were stuffed into a duffel bag. One bomb contained shards of metal and ball bearings; the other was filled with nails, the source said.
Investigators found pieces of black nylon from a bag or backpack, along with BB and nail fragments that may have been packed in a pressure cooker, according to an FBI agent.
Copyright 2013 Tucson News Now. All rights reserved. The AP contributed to this report.