5 arrested in US for trying to blow up bridge

"The public was never in danger from the explosive devices" because an undercover FBI agent was involved and the explosives were inert, the bureau said in a statement.

"The defendants were closely monitored by law enforcement," the statement said.

Authorities, according to CNN, say three of the men are self-proclaimed anarchists who had considered "a series of evolving plots over several months."

The FBI said the individuals allegedly conspired to acquire C-4 explosives and build two improvised explosive devices to be remotely detonated. PTI DDC SAI