CHICAGO (STMW) — A NATO protester was sentenced to three years in prison Thursday after admitting he tried to buy a pipe bomb during the protests in Chicago last year, the Sun-Times is reporting.

Mark Neiweem, 28, had been looking to buy pipe-bomb materials, including PVC pipe, caps, glue and model rocket engines, authorities said.

To carry out his plans, Neiweem, of Chicago, had met with associates at a Cook County forest preserve to discuss obtaining parts for a pipe bomb.

He was charged with solicitation for possession of explosives or incendiary devices.

At the time of the 2012 crime, Neiweem was on probation for punching a Chicago Police officer in the face two years before.

(Source: Sun-Times Media Wire © Chicago Sun-Times 2013. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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