Thermite, a commonly used component in welding, was used in a string of ballot box arsons before the November election ...

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"Thermite devices are composed of metal shavings and iron oxide. Iron oxide's also known as rust," Olson said. "This is a very volatile mix that can burn ... we ask you to report unusual behaviors ...

FBI officials investigating the October ballot box arsons in Vancouver and Portland renewed requests for tips Thursday, ...

The FBI believes the suspect used a substance known as thermite, made from metal shavings and rust, in the devices put in the ballot boxes, agents said. "This is a very volatile mix that can burn ...

and Portland renewed requests for tips Thursday, saying they’re seeking someone who is knowledgeable about explosives or thermite ... by our own staff. You can read more about our community ...

He described thermite as a mixture of metal shavings and iron oxide, or rust, commonly used by welders. He said the mixture can be dangerous if not handled safely. The suspect welded scrap metal ...

Watch the full news conference: "Thermite devices are composed of metal shavings and iron oxide. Iron oxide's also known as rust," Olson said. "This is a very volatile mix that can burn as hot as ...

“We’re very worried this person may harm himself or others if he continues to experiment with thermite,” said W. Mike Herrington, the FBI special agent in charge in the Seattle office.