1. nails, BB, nylon

    FBI Unveils New Findings at Presser

    Image #: 22001165    Blood in seen on the sidewalk in front of a candy store advertising a Marathon Monday sale a day after two explosions at the Boston Marathon in Boston, Massachusetts April 16, 2013. Two bombs packed with ball bearings tore through crowds near the finish line of the Boston Marathon on Monday, killing three people and triggering  a massive hunt for those behind an attack the White House said would be treated as "an act of terror." REUTERS/Jessica Rinaldi (UNITED STATES - Tags: CRIME LAW CIVIL UNREST SPORT ATHLETICS BUSINESS)       Reuters /JESSICA RINALDI /LANDOV

    Jessica Rinaldi/Reuters, via Landov

    The tragedy in Boston continues to be a whodunit. The FBI held a press conference Tuesday afternoon to announce updates in their probe of the Boston bombings. Special Agent Richard DesLauriers said the investigation has recovered fragments of black nylon, BBs, and nails "possibly from a pressure cooker device" at the scene. "Somebody knows who did this," he said. The bureau announced it would bring in digital video experts from Quantico to dissect the "tremendous" amount of video police have turned over. On Thursday, President Obama will visit Boston to speak at an interfaith service.

    Read it at The Daily Beast