International Atomic Energy Agency (IAEA) experts did not visit or inspect any nuclear site in Iran during their three-day visit to the country, an unnamed source told the official IRNA news agency on Tuesday.

The IAEA team had only travelled to Iran for talks with the Iranian side, the source was quoted as saying.

The three-day talks between Iranian officials and the IAEA team ended on Tuesday and the spirit dominating the talks was "positive and constructive," the IRNA said, quoting the source.

Earlier in the day, the local Fars news agency said that the IAEA and Iran agreed to continue their talks regarding the Islamic republic's nuclear program after three days of meetings.

Fars also said the newly-concluded meetings were "positive and constructive" and that the next round of the talks has been scheduled but did not specify the date and location.

On Sunday, a high-ranking IAEA delegation headed by chief inspector Herman Nackaerts arrived in Tehran for talks with Iran over its sensitive nuclear program.

The talks were held behind closed doors and no details about its process or outcome were released.

Last November, the board of the IAEA adopted a resolution on Iran's controversial nuclear program, which called for intensified dialogue to find solutions to unresolved issues.

However, Iran has said the resolution will not stop its nuclear program which it insists is peaceful in nature despite the West's accusation of military purposes.