Mohsen Fakhrizadeh

The Iranian parliament speaker's latest declaration escalates tensions amid diplomatic efforts in Vienna to save Tehran's atomic accord with world powers.

Iran has exceeded some limits of the 2015 agreement in the past but this move would mark a notable step toward strengthening its nuclear capacity. The U.S. withdrew from the pact in 2018.

Iranian President Hassan Rouhani blamed Israel for the ambush that left Mohsen Fakhrizadeh and others dead Friday. Without offering specifics, he threatened a reprisal.