TULSA, Okla. -- The Alcohol, Tobacco and Firearms Bureau is taking over the bomb investigation from West Tulsa.
They're now trying to figure out why suspect Brandon Walker was keeping the device in his house, and the likelihood of it being detonated on 59th West Avenue.
Two additional arrests were made on Friday, and the Tulsa County Sheriff's Office said at least three men were involved in a chop shop ring that's been going on for months.
"I believe they were actually living there. Great cause for concern. This was a legit device. It's very unstable, anything could have happened. So that's why additional charges were added on," said Casey Roebuck with the Tulsa County Sheriff's Office.
The ATF is taking a closer look this week at how legitimate the two part device is, but right now they believe there was potential for detonation.
"We don't know how unstable it is. We don't know what might set it off. Even something as simple as a static electricity charge is sometimes enough to ignite a device," Roebuck said.
Roebuck said only four cars were found in Berry Hill, which led them to a property in Leonard and they said additional cars were kept at that home as Walker became suspicious of officers in the area.
They believe this was going on longer than September, which is when the investigation began.
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