Huh. So it turns out that the sounds coming from the Thunder Pit were pipe bomb explosions after all. This guy was arrested on my street, apparently.

From The Globe and Mail:

Police find drug cache at bomb suspect’s house
By Chris Lackner
Tuesday, July 20, 2004 – Page A11

While arresting a man suspected of three pipe-bombing incidents, Toronto police also discovered drugs yesterday.

A large quantity of ecstasy, Special K, cocaine and other drug-related paraphernalia were discovered when a search warrant was executed at the residence of 21-year-old William James Leriche of Toronto.

A hunting rifle and large amounts of cash were also found, police said.

Mr. Leriche faces nine drug charges and 13 charges related to explosives.

No individuals were injured in the alleged bombing incidents, but there was heavy property damage.