Domestic American law enforcement is on high alert as the U.S. and Israel execute combat operations against the world’s chief state sponsor of terrorism. But what the Islamic Republic of Iran can’t reach, its sympathizers in the West can.

On Thursday, the FBI arrested siblings Ann Mary Zheng and Alen Zheng for allegedly attempting to target Florida’s MacDill Air Force Base with an improvised explosive device. The plot the pair are charged with executing and attempting to conceal was not an impulsive endeavor.

The explosive device the pair placed inside MacDill AFB was designed to be just one of several bombings,........

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