Associated Press
Tracks for the Cuyahoga Valley Scenic Railroad run under a bridge at the Cuyahoga Valley National Park in Brecksville, Ohio, on Tuesday, May 1, 2012. Five men have been arrested for conspiring to blow up the high level bridge over the Cuyahoga River valley, but there was no danger to the public because the explosives were inoperable and were controlled by an undercover FBI employee, the agency said Tuesday in announcing the men's arrests.  (AP Photo/Amy Sancetta)

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