Negotiations between Iran and the United States over Tehran’s rapidly advancing nuclear program will move Wednesday to what’s known as the “expert level” — a sign analysts say shows that the talks are moving forward rapidly.

Negotiations between Iran and the United States over Tehran's rapidly advancing nuclear program will move Wednesday to what's known as the expert level a sign analysts say shows that the talks are moving forward rapidly.

US and Iranian delegations will gather in Rome Saturday for a second round of high-level talks on Tehran’s nuclear program amid tempered optimism about a diplomatic way forward.