As the Boston Marathon bombing investigation continues, ABC News, USA Today, and CNN have reports that a letter sent to Senator Wicker has tested positive for ricin in three initial tests. The letter was stopped at a processing center before it was delivered to Capitol Hill. According to the CNN report, "Sen. Claire McCaskill told reporters after a briefing for lawmakers that a suspect has already been identified in the incident. Members will be warning their home-state offices to look out for similar letters, she said." The letter has been sent to a Maryland lab for further testing.
Boston.com reports that "Investigators combing through the scene of the deadly Boston Marathon terrorist attack have recovered a circuit board that they believe was used to detonate the bombs, according to an official briefed on the investigation."
It has also been reported that the bombs "consisted of two 6-liter pressure cookers packed with nails, ball bearings, and other metal." and that "The makeshift bombs were placed in black duffel bags...." the report states.
"One of the bombs used in a foiled attack in New York’s Times Square in 2010 was fashioned from a pressure cooker. A joint warning issued by the FBI and the Department of Homeland Security in 2010 said pressure cookers has been used for bombs in multiple attacks in Afghanistan, Pakistan, India, and Nepal," stated an earlier article on Boston.com.
As the investigation continues, the nation shows its support for Boston with various tributes and moments of silence in Congress, and at other public venues and events, reported the ABC Evening News.
Boston.com lists various links for those who either have information they think might help or who want to donate to victims.