Iran has accelerated its production of near weapons-grade uranium as tensions between Tehran and Washington rise after the election of U.S. President Donald Trump, a report by the United Nations’ nuclear watchdog seen by The Associated Press on Wednesday showed.

Iran's stock of uranium close to weapons grade has jumped since December, two reports by the U.N. nuclear watchdog said on Wednesday.

Two quarterly reports sent by the IAEA to member states showed that while the stock of 60% material has grown by around half, there has been no real progress on resolving long-running issues with Iran, including the unexplained presence of uranium traces found at undeclared sites.