Who Was Behind The Explosion That Rattled Tracy?

TRACY (CBS13) — An explosion shook up Tracy on Tuesday, leaving residents wondering if they should be worried.
Maureen Stapleton spent years living across the street from Lawrence Livermore Laboratory’s explosive testing site, but she says Tuesday was different.
“I’ve never heard or felt one like that. It felt like a real bomb had gone off,” she said.
The blast at around 7 p.m. was heard and felt in central Tracy, nearly 15 miles from the testing site.
It turns out