Five Iranians -- four men and one woman -- in the northwestern Iranian city of Urmia have been sentenced by a court to death for allegedly engaging in intelligence cooperation and espionage activities that benefited Israel.
Hengaw, a Norway-based group that monitors rights violations in Iran's Kurdish regions, said one of those sentenced to death is Mansur Rasuli, whose interrogation by Mossad agents in Iran made headlines last year.
At least five other people have been sentenced to lengthy prison terms in the case, the report added.
Last year, Israeli media reported that agents for the Mossad security service captured and interrogated a member of the Islamic Revolutionary Guards Corps inside Iran.
Later, a video was released in which a person who identified himself as Rasuli admitted he wanted to assassinate an Israeli diplomat working in the country's consulate in Istanbul, as well as a U.S. general stationed in Germany and a journalist in France.
Iran and Israel have been engaged in a years-long shadow war. Tensions have been nearing a boiling point in recent years.
In November, the semiofficial Mehr News agency reported that Iran sentenced to death four people accused of collaborating with Israel. The four were accused of having interrogated people in Iran with intelligence cooperation from Mossad, the Israeli secret service.
Tensions have also flared between the two countries as negotiations aimed at reviving the 2015 nuclear deal between Iran and world powers remain deadlocked. In the absence of a deal that would curb Iran's sensitive nuclear activities in exchange for the lifting of U.S. sanctions, Tehran has reduced its commitments and expanded its nuclear activities.
Iran has been roiled in recent months by nationwide protests sparked by the death of a young woman while she was being held in police custody for allegedly wearing a head scarf improperly.
Tehran has blamed Israel, the United States, and other Western countries for the unrest, which has seen security forces kill more than 500 people, according to human rights groups, including dozens of minors.
Officials have not shown any evidence to back up their accusations that the West has been involved in the anti-government uprising.