Boston PD press conference just concluded. Three devices confirmed, two at the Marathon and one at JFK Library at Dorchester. One controlled explosion of a suspicious package done by a bomb squad.
JFK library may just be a fire in the mechanical room, per the JFK library staff. Still investigating.
Casualty count varies. Last count I heard was 8 patients at Brigham & Young Women's Hosp; 18 at Mass General; 14 at Tufts.