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Iran conducted a new execution on Monday as it continues its crackdown on the population.

Iran has conducted a new execution as it continues its crackdown on the population during the war with the Israel and United States.

This time the regime hanged Erfan Shakourzadeh, a 29-year-old grad student at Tehran's Iran University of Science and Technology. He was accused of working for the CIA and Israel's Mossad, CBS News noted.

Rights groups Iran Human Rights and Hengaw said the man had written a note claiming the charges against him were fabricated.

"I was arrested on fabricated espionage charges and, after eight and a half months of torture and solitary confinement, was forced into a false confession. Do not let another innocent life be taken in silence," the note read.

Iran Human Rights said he was held in "in solitary confinement and subjected to torture and forced to give false confessions."

CBS News detailed that Shakourzadeh is the first person to be hanged on espionage charges since the war began in late February.

The regime executed three other people who were arrested during the January protests last week.

"The international community, and the EU in particular, must respond firmly to the ongoing wave of executions. Unless the political cost is raised through clear and strong international reactions, there is a serious risk that these executions will continue on a daily basis in the coming weeks and months!", Mahmood Amiry-Moghaddam, the director of Iran Human Rights said after the executions.

ran's state media, Tasnim News Agency, confirmed the deaths of Ebrahim Dolatabadinejad, Mehdi Rasouli, and Mohammadreza Mir. The agency described on its website the men as "Mossad elements" who "carried out violent acts."

The state-run news agency claimed the men played a role in the deaths of two regime members.

"Ultimately, the court considered the defendants' actions to be an example of an operational action capable of killing, destroying private and public places and property, and creating public terror," it reported.

The protests, which were driven in part by economic factors including the depreciation of the rial, began in December and culminated in the second week of January when the regime severed internet access and launched a brutal crackdown. Estimates of protesters killed by the regime in January have fluctuated between 7,000 and more than 36,000. The killings reportedly happened over the course of a few days.