Explosions at the Boston Marathon. People killed, including a child; grisly injuries among runners and spectators.
- Photos of the carnage.
- Video of the blast as seen by a runner.
- Schneier recommends responding to terrorism with indomitable calm.
- How to Help.
May all affected find aid and comfort, and the bombers be brought to justice.
Update: Speaking of bringing the bombers to justice, a timeline of the hunt for the suspects, and profiles of the Tsarnaev brothers from NYTimes and Boston Globe.