Iran said Thursday it would soon open a third uranium enrichment site, a major escalation after the United Nations nuclear watchdog agency decided for the first time in two decades that Tehran had failed to comply with its nonproliferation obligations.

VIENNA (AP) — Iran said it has built and will activate a third nuclear enrichment facility, ratcheting up tensions with the U.N. on Thursday immediately after its atomic watchdog agency censured Iran for failing to comply with nonproliferation obligations meant to prevent it from developing a nuclear weapon.

The International Atomic Energy Agency’s board of governors on Thursday adopted a resolution condemning Iran's "non-compliance" with its obligations for the first time in 20 years, potentially