Bomb Details Emerge in Boston Case  —  BOSTON — The explosives used to kill three people and injure 176 at the Boston Marathon on Monday were likely some kind of “pressure-cooker” devices that sent sharp bits of shrapnel flying into victims in the vicinity of the blast, several law enforcement officials said Tuesday.

Injured Saudi is a witness, not a suspect, in Boston bombing  —  U.S. law enforcement officials said Tuesday that a Saudi national injured in the Boston Marathon bombing is regarded as a witness, not a suspect.  —  The Saudi, who is recuperating at a Boston hospital, is in his 20s …

Report: 2 escorted off Boston plane  —  Officials in Boston are taking no chances, a day after the tragedy at the Boston Marathon — including on flights out of nearby Logan Airport.  —  A plane headed to Chicago was brought back to the gate at Logan Airport, after some passengers …

Jack Kingston urged Guard ‘take a pass’ on Boston Marathon  —  A year ago, Rep. Jack Kingston was so concerned about the National Guard's shriveling budget that he wanted it to “take a pass” on major events like “the Boston Marathon.”  —  The Georgia Republican pleaded with the guard's leaders …

PHOTOS of SAUDI NATIONAL Person of Interest in Boston Custody ...Update: Saudi Ruled Out as Suspect  —  Here is the Facebook page of the Saudi national guarded by federal agents at a Boston hospital.  —  Abdulrahman Ali Alharbi  —  The name was released by Townhall and Free Republic.

An Al-Shabaab Link to Boston Marathon Bombings?  —  A series of Twitter gloats today raised questions about the possible involvement of Somali terror group Al-Shabaab in the Boston Marathon bombing.  —  No person or group has yet directly taken responsibility for the attack that killed three and wounded 176, 17 of those critically.

Is The Reinhart-Rogoff Result Based on a Simple Spreadsheet Error?  —  So this is huge.  Or, rather, it won't matter even a tiny little bit but it ought to be a big deal anyway.  You've probably heard that countries with a high debt:GDP ratio suffer from slow economic growth.

Envelope tests positive for ricin at Washington mail facility  —  Washington (CNN) — An envelope that tested positive for the deadly poison ricin was intercepted Tuesday afternoon at the U.S. Capitol's off-site mail facility in Washington, congressional and law enforcement sources tell CNN.