U.N. nuclear agency officials have again failed to reach a deal with Iranian counterparts that would allow the agency to relaunch its probe of suspicions that Tehran might have worked on atomic arms.

It is the 10th inconclusive meeting between the International Atomic Energy Agency and Iran on the issue over the past year and a half. The IAEA's investigation has stalled for more than five years, with Tehran saying it has answered all questions it is obliged to.

Iran denies any interest in nuclear arms. Its chief negotiator, Ali Asghar Soltanieh, called Wednesday's talks "constructive."

Herman Nackaerts, who heads the IAEA team, told reporters that the agency would continue seeking a deal although "our best efforts have not been successful so far."

No new meeting date was set.

AP