ROME -- The second round of indirect talks between Iran and the United States concluded on Saturday in Rome, capital of Italy, with Oman's mediation, according to Italian media.

The atmosphere of the talks was described as "constructive", and the next round is expected to take place in the coming days, Italian Rai News reported.

The talks took place at the Omani Embassy in Italy and lasted nearly four hours. The format of the dialogue remained "indirect",?as in the first round, Rai News reported.