The head of the UN's nuclear agency on Wednesday signalled that Iranian nuclear enrichment sites would be visited by his inspectors, a key component in the interim deal between the United States and Iran to reach an end to the war. International Atomic Energy Agency (IAEA) head Rafael Mariano Grossi made the comments in Tokyo. "Whether this happens the day after tomorrow or in one week or in 10 days, it's important, but not essential," Grossi told journalists.