FBI Special Agent in Charge Richard DesLauriers said that they believed the devices used in the attack may have been pressure-cooker bombs stuffed with BBs and nails. Investigators said the bombs may have been left inside nylon bags or backpacks.
Originally published on Mon April 15, 2013 8:02 pm
ROBERT SIEGEL, HOST:
Investigators are gathering evidence related to the blasts. Law-enforcement officials have been cautious about providing any details. NPR's counterterrorism correspondent Dina Temple-Raston is here with the latest. And Dina, do investigators have any leads?