EXPLAINER-What are US sanctions on Iran? How can Washington impose more?

News Snapshot:

By Daphne Psaledakis WASHINGTON, April 16 (Reuters) - The United States has warned it will impose new sanctions on Iran following its unprecedented attack on Israel. U.S. Treasury Secretary Janet Yellen on Tuesday said new sanctions on Tehran - which could be focused on reducing the country's capacity to export oil - would come within days. Congressional Republicans also are considering a series of bills on Iran. Here are details about existing measures against Iran and what the U.S. might do next: WHAT IS THE SCOPE OF EXISTING U.S. SANCTIONS ON IRAN? Washington's sanctions on Iran already ban nearly all...