This Boston thing reminds me a lot of the Bryce Ashley Reed situation in West Texas.

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West Texas Fertilizer Plant Explosion "cell" connection...

West Man Arrested For Destructive Device
An affidavit says on April 26, someone in the town of Abbott unwittingly took a galvanized metal pipe, fuse, lighter and a number of chemicals from Reed. The chemicals included potassium nitrate, aluminum powder, Iron Oxide, and Ammonium perchorate. The affidavit says all the items are elements of a pipe bomb. Court documents say the person who had the materials called the McLennan Coutny Sheriffs Office Tuesday, and Reed admitted they were his.
[link to dfw.cbslocal.com]

Cause of catastrophic Texas explosions remains mystery
Investigators have not ruled out an intentional fire being behind explosions at a fertilizer plant in the small town of West that left 15 people dead, the Texas fire marshal said Thursday.
State Fire Marshal Chris Connealy said investigators were unable to rule out three possible causes, including a spark from a golf cart, an electrical short or an intentionally set fire.
"The cause cannot be proven to an acceptable level," Connealy told reporters.
Investigators said the incident was actually two simultaneous blasts triggered by the fire. The blasts, which registered on seismographs as a magnitude 2.1 earthquake and was felt 50 miles away, caused damage to a 37-block area of the town.
[link to www.cnn.com]

West, Texas: The Town That Blew Up
Two and a half months later, the cause of the West fire remains officially undetermined. An investigation led by the state fire marshal and the ATF continues. Fire investigation is a subtractive process—investigators cross off potential causes until, ideally, there’s only one left. At this point, the West investigation is down to three. The first is the building’s electrical system. The second is a golf cart; the workers used one to get around the facility, and both electric and gas-powered golf carts have been recalled in recent years for catching fire.
The third option is arson, though no one has been charged, and investigators haven’t suggested how someone might have set the fire. On May 10, Bryce Reed, a former West volunteer paramedic, was arrested and charged with possession of a pipe bomb. In the blast’s aftermath, Reed had made dubious claims to the press about his role in the response and was quickly let go from West EMS. He has strongly denied setting the fire, however, and law enforcement officials, at least on this count, say they believe him. “At this time we can find no connection whatsoever between Bryce Reed, the pipe bomb, and the explosion at West,” Sheriff McNamara says.
[link to www.businessweek.com]

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Personally I don't think any of this crap is an accident, and I believe there is a lot more to these seemingly unrelated events then meets the eye, but they don't want that aspect to be known yet (as it all part of a bigger agenda at play).