A Swedish-Iranian national sentenced to death in Iran on charges of spying for Israeli intelligence is to be executed this month, Iran’s semi-official ISNA news agency said on Wednesday, citing sources.

Ahmad Reza Jalali, a disaster medicine doctor and researcher, was arrested in 2016 on an academic visit to Iran and is to be executed by May 21, ISNA said.

Jalali, a medical doctor and lecturer at the Karolinska Institute, a Stockholm medical university, was accused of providing information to Israel to help it assassinate several senior nuclear scientists.