Iranian Foreign Minister Javad Zarif announces sudden resignation

Iran's foreign minister, Mohammad Javad Zarif, who played a key role in the 2015 nuclear deal, announced his resignation today.

"I sincerely apologize for the incapacity to continue serving and all the shortcomings during the service," Zarif wrote on his Instagram account, adding, "Be happy and upbeat."

Deputy foreign ministry spokesman Sayyed Abbas Moussawi confirmed Zarif's resignation in an interview with Iran state media IRNA.

Zarif was the key architect in the landmark deal aimed at reining in Iran's nuclear program - which US President Donald Trump withdrew from last year.

This is a breaking story. More to come.

With CNN.