Former aide to King Abdullah Bassem Awadallah and Sharif Hassan bin Zaid, a member of the royal family, were sentenced to 15 years in prison in July after being convicted of conspiring with Hamzah, a former crown prince, and of seeking foreign assistance.
The nuclear agency also says that some of its surveillance equipment went missing following an explosion in an Iranian centrifuge manufacturing facility in Karaj, northwest of Tehran, in June.
Blinken travels to Qatar and will also stop in Germany to see Afghan evacuees at Ramstein air base who are awaiting clearance to travel to the United States.
Statement comes a day after US announces sanctions over plot to kidnap journalist
Move comes as Palestinian Authority President Mahmoud Abbas says he is "ready" to take confidence-building steps to make a two-state solution impossible.
The decision apparently followed senior Reuters chief correspondent for Jordan and Syria Suleiman al-Khalidire's refusal to obey authorities' demand that he surrender his company laptop computer and mobile phone.
Hamas and other terrorist factions say the tunnel workers died when toxic gas was pumped into a "trading tunnel," calling it "murder for which Egyptian authorities bear full responsibility."
France and Germany on Wednesday urged Iran to return rapidly to nuclear negotiations, after a break in talks following Iranian elections in June, with Paris demanding an "immediate" restart amid Western concerns over Tehran's expanding atomic work.
"Lebanon is in free fall. We've seen this movie before and it's a horror story; but the good news is it can, should, and hopefully will be avoided," Senator Richard Blumenthal tells reporters at the end of a two-day visit.
Iran-backed terror organization is blamed by most Lebanese for the devastating, multiple crises plaguing the country, including a dramatic currency crash and severe shortages in medicine and fuel.
