Updated

The U.N. atomic agency is renewing efforts to gain access to an Iranian military site it suspects was used for experiments to develop nuclear arms.

Iran has denied experts of the U.N.'s International Atomic Energy Agency permission to visit the Parchin site since their first request early this year, despite repeated meetings between the two sides.

Tehran says a visit is possible only after extensive planning and a detailed outline of procedures -- a caveat IAEA officials describe as a stalling tactic.

The U.N. agency announced that a new meeting was planned for Friday.

It said Tuesday that the two sides will meet for talks "to resolve issues relating to Iran's nuclear program" -- terminology that also described previous sessions where the IAEA failed to secure permission to visit the site.