[Velveeta]

He described the objects found as "sort of an explosive device," but "more of a pressure-producing device." He said the objects are designed to create sound, and "damage if you are close to it." He said it was possible but generally unlikely that the items could be considered lethal.

How strange.

[all4one]

Link to FR Thread on this article:

Police recover 'pressure devices' linked to 'Mystery Booms'

http://www.freerepublic.com/focus/f-news/1286883/posts

[Godzilla]

Sounds (no pun intended) like a carbon dioxide bomb.