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This animation depicts the site of the second explosion and provides details on the possible construction of the one of the bombs, based on currently available information.
Reuters reports: "Boston Marathon bombing investigators on Wednesday entered the third day of their hunt with an emerging picture of the target: a suspect or suspects carrying heavy bags or backpacks made of dark nylon."
"While still unable to conclude whether a group or individuals were responsible for the attacks that killed three people and wounded 176, and whether they were foreign or American, investigators gathered enough evidence at the crime scene on Tuesday to slightly narrow their search.
"The two blasts struck seconds apart on Monday at the finish line of the race, maiming victims with shrapnel-packed bombs that investigators suspect were contained in pressure cookers. Seventeen people remained in critical condition."
"Evidence collected at the scene was being reconstructed at the FBI laboratory in Quantico, Virginia, said Richard DesLauriers, the Federal Bureau of Investigation's special agent in charge in Boston.
"Among the items recovered were pieces of black nylon that could be from a backpack, fragments of ball bearings and nails, and possibly the remains of a pressure cooker device, DesLauriers said.
"Bomb scene pictures produced by the Boston Joint Terrorism Task Force and released on Tuesday show the remains of an explosive device including twisted pieces of a metal container, wires, a battery and what appears to be a small circuit board."
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