LA times picks up the Suadi angle
1 person questioned in Boston Marathon explosions

A federal law enforcement officials said authorities were questioning a Saudi national who was taken to a Boston hospital with injuries. The person was not identified as a suspect.

The official also said authorities are also “desperately seeking” a Penske rental truck seen leaving the race site. They further believe the explosive devices were small bombs placed in small receptacles and that at least one was detonated in a nearby trash can.

The reaction from authorities and the Presidential address makes me think this might not be the actions of some lone nut or domestic zealot.