UN atomic agency head says 'more work' needed on probe of alleged Iranian nuclear weapons work

A worker pulls a trolley with flowers out of Palais Coburg where closed-door nuclear talks with Iran take place in Vienna, Austria, Friday, July 3, 2015. (AP Photo/Ronald Zak) (The Associated Press)

TV cameras stand in front of Palais Coburg where closed-door nuclear talks with Iran take place in Vienna, Austria, Friday, July 3, 2015. (AP Photo/Ronald Zak) (The Associated Press)

U.S. Secretary of State John Kerry, center, National Security Council point person on the Middle East Robert Malley, left, and Chief of Staff at the U.S. Department of State Jon Finer meet on the terrace of a hotel where the Iran nuclear talks meetings are being held in Vienna, Austria, Thursday, July 2, 2015. (Carlos Barria/Pool via AP) (The Associated Press)

The head of the U.N. agency tasked with monitoring any Iran nuclear deal is suggesting that a meeting with Iran's president has done little to advance his probe of alleged work by Tehran on an atomic weapon.

Yukiya Amano of the International Atomic Energy Agency said Friday "more work will be needed" to kick-start the investigation. Iranian President Hassan Rouhani continues to deny the allegations, reflecting the stalemate that has stretched to nearly a decade.

Rouhani said after Thursday's meeting with Amano that the agency now understands that the "pointless allegations" are "baseless."

The U.S. and its allies says the agency must deliver a ruling on the suspicions based on Iranian cooperation, as part of the overall nuclear deal now being negotiated between Iran and six world powers.