On top of everything else, a bomb blew up outside the office of the Colorado Springs, Colorado NAACP chapter yesterday.

An unnamed FBI official has told CBS News that at least one of the explosive devices detonated in Boston yesterday appears to have been improvised from a conventional pressure-cooker. Unnamed law enforcement officials don't exactly have the strongest record of credibility in the immediate aftermath of events like these, but federal authorities are well-acquainted with this type of IED.