The Patch has a story about unexplained explosions in Hanover Mass south of Boston. Commenters allege a connection. The Patch is a chain of local papers.
Comments in this article claim a connection
http://northreading.patch.com/articles/tsarnaev-admits-to-detonating-marathon-bombs
This article is about the explosions.
It mentions “unexploded devices” that the State Police bomb squad detonated. No description of the devices is given.