In this photo released by the Atomic Energy Organization of Iran, technicians work at the Arak heavy water reactor's secondary circuit, as officials and media visit the site, near Arak, 150 miles (250 kilometers) southwest of the capital Tehran, Iran, Monday, Dec. 23, 2019. The head of Iran's nuclear agency says his country has begun new operations at the heavy water nuclear reactor. The move intensifies pressure on Europe to find an effective way around U.S. sanctions, which block Tehran's oil sales abroad. (Atomic Energy Organization of Iran via AP)
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