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Different library. The one the Globe tweet refers to is the Boston Public Library, right by the finish line. The JFK Library is on the opposite side of the city.

Since then the Boston Commissioner of Police has confirmed it as a non-controlled explosion during a press conference.

Bloomberg quoting AP: 2 additional devices found and being dismantled in Boston right now.

(3:24p CST)

> UPDATE: One report was of unexploded device on the glass footbridge over Huntington Ave near Copley place

> RT @ReutersUS: Boston police confirms another explosion at JFK Library #breaking