A Houston man is set appear before a federal magistrate Monday afternoon on charges he participated in a bomb plot, trying to transport deadly explosives, according to a news release from U.S. Attorney Kenneth Magidson.

Cary Lee Ogborn, 50, was arrested late Friday after retrieving a package he thought contained explosives powerful enough to maim or kill people or destroy buildings.

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In 2013, Ogborn pleaded guilty in Harris County to knowingly possessing illegal metal knuckles and served a 30-day jail sentence. That same year he pleaded guilty and served time in Montgomery County for illegal possession of a firearm. Ogborn has a prior convictions from 2004 for driving with a suspended license in 2004 and committing insurance fraud, lying about a stolen car, in 1996. He served time for 1989 convictions for auto theft, and possession of cocaine and marijuana.

Investigators believe Ogborn tried to order the explosive materials online from an illegal weapons marketplace through an encrypted network, that rendered his IP address undetectable and made him anonymous. He sent a private message to a vendor on this network in August saying he intended to use the materials to blow up a building. It turned out the vendor was an undercover FBI agent, according to court documents.

Ogborn then ordered the materials. He went to a post office box to pick them up. Officials arrested him shortly thereafter.

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He will be arraigned before U.S. Magistrate Judge Frances H. Stacy at 2 p.m.