Israel is believed to have carried out numerous highly secretive attacks on Iranian soil over the years, though it has rarely acknowledged them. Most have been aimed at Iran’s nuclear program, though Iran has also accused Israel of targeting its natural gas pipelines and of assassinating Hamas political leader Ismail Haniyeh in Tehran.

"I am pleased to confirm the 6th round of Iran US talks will be held in Muscat this Sunday the 15th," Bad Albusaidi, the country's foreign minister said on social media.

Tehran issues a bold nuclear ultimatum ahead of the sixth round of nuclear talks. Iran's foreign minister signaled a deal with the U.S. is possible, but only if Iran can continue uranium enrichment and U.