VIENNA (AP) — Officials from Iran and the U.N. nuclear watchdog will meet in Tehran next month in an attempt to restart stalled nuclear talks, the international agency announced Friday.

Such a meeting would be the first since early summer. The talks have been halted over Iran’s reluctance to grant access to sites that the U.N. nuclear agency suspects could have been used in secret work on nuclear weapons. Iran denies any such work, and says all of its nuclear activities are for peaceful purposes.

The spokeswoman for the International Atomic Energy Agency, Gill Tudor, announced that the talks will take place Dec. 13 in Tehran.

“The aim is to conclude the structured approach to resolving outstanding issues related to Iran’s nuclear program,” she said in an email to journalists.