UN nuclear inspectors arrive in Iran on long stalled visit to try and probe suspicious tests

FILE - In this Sunday, April 12, 2015 file photo, Iranian President Hassan Rouhani speaks at a ceremony to commemorate the late Khadijeh Saghafi, wife of late revolutionary founder Ayatollah Khomeini, in Tehran, Iran. Rouhani has dismissed pressure from the U.S. Congress over a preliminary deal on Iran's nuclear program, saying that Tehran is dealing with world powers not American lawmakers. (AP Photo/Vahid Salemi, File) (The Associated Press)

In this photo released by the official website of the office of the Iranian Presidency, Iran's President Hassan Rouhani delivers his speech in a public gathering in the city of Rasht during his tour to the northern province of Gilan, Iran, Wednesday, April 15, 2015. Iranian President Hassan Rouhani on Wednesday dismissed pressure from the U.S. Congress over a preliminary deal on Iran's nuclear program, saying that Tehran is dealing with world powers — not American lawmakers. (Mohammad Berno, Iranian Presidency Office via AP) (The Associated Press)

TEHRAN, Iran – U.N. nuclear inspectors are in Iran on a long stalled visit meant to investigate suspicions that Tehran worked on nuclear weapons, a charge the Islamic Republic denies.

The official IRNA news agency is quoting Iranian nuclear spokesman Behrouz Kamalvandi as saying that inspectors from the Vienna-based International Atomic Energy Agency arrived in Tehran on Wednesday to discuss "unresolved issues" surrounding a military site in Marivan, in western Iran.

A 2011 IAEA report indicated that large-scale high-explosive experiments were conducted in Marivan, near the Iraqi border.

Talks with the IAEA are parallel to Iran's nuclear negotiations with world powers seeking a permanent agreement on curbing the country's nuclear activities by June 30 in return for the lifting of economic sanctions.

Iran insists its nuclear program is for peaceful purposes only.