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By Colin P. Clarke

Mr. Clarke is the director of research at the Soufan Group, an intelligence and security consulting firm based in New York City.

After more than a week of an Israeli bombing campaign against Iran, the United States joined the fray with an attack against Iran’s nuclear facilities. The United States now braces for Iran’s response, which seems imminent. Speaking on Iranian television after the American attack, a news anchor declared, “Mr. Trump, you started it, and we will end it.”

So what could the Iranian response look like? Among the most likely options are asymmetric operations, such as attacks on U.S. troops in the region, or terrorist attacks by Iranian proxies in the West, potentially in the United States.