Iran lashes out at Austria after a report claims Tehran has an advanced nuclear weapons program, sparking diplomatic tensions and calls for explanations.

Iran's foreign ministry and the Iranian nuclear agency rejected the report, calling it "politically motivated" in a joint statement.

Iran carried out secret nuclear activities with material not declared to the U.N. nuclear watchdog, the confidential report said.

A new Austrian intelligence reports says Iran is continuing with its nuclear program as the U.S. and Iran hold indirect talks over dismantling Tehran’s atomic weapons program.

President Donald Trump believes his administration is “very close to a solution” on an Iran nuclear agreement and he has personally warned Israeli Prime Minister Benjamin Netanyahu not to disrupt the talks,

U.S. President Donald Trump's threat to destroy Iran's nuclear facilities is a clear red line and will have severe consequences, the semi-official Fars News Agency reported on Friday.