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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 that the blast wasn't from Lawrence Livermore's Site 300, as the lab says it doesn't test explosives at night. A hydrogen plant in Rodeo says a flare shook up local residents, but it says the impact west of Martinez didn't reach Tracy.

Instead, SRI International in Alameda County took responsibility for the explosion. A spokesperson didn't say what exactly caused the blast, but says it was standard testing.

The company says it notified the Tracy Police Department about the evening testing before it went off on Tuesday.

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