According to the POST REPORT:
Authorities have a identified a suspect, a Saudi national, who is currently being guarded in a Boston hospital with shrapnel wounds.
Law-enforcement sources said at least the first explosion occurred in the lobby of a nearby hotel.
Police are also investigating a third explosion at the John F Kennedy Presidential Library .. it may be connected.. Developing..
Cell phone service shut down in downtown Boston to prevent detonation of devices, WBZ reports