Inspectors from the U.N. nuclear watchdog are in Tehran for negotiations and verification, Iran's nuclear chief Mohammad Eslami said, according to the semi-official Tasnim news agency. "Officials of the International Atomic Energy Agency are in Tehran and have been starting negotiations, visits and check-ups since yesterday. Ambiguities created by an inspector are being resolved," the head of Iran's Atomic Energy Organization said. Last week, the U.N. nuclear watchdog said it was discussing the results of recent verification activities with Iran after Bloomberg News reported that the agency had detected uranium enriched to 84 percent purity, which is close to weapons grade. To read the original story by Reuters, click here.