Iranian authorities have handed over Lebanese detainee Nizar Zakka to General Security chief Abbas Ibrahim, the National News Agency reported on Monday.

Both men are expected to return to Beirut on Tuesday, media reports mentioned.

Iran had sentenced Zakka, a Lebanese citizen with permanent U.S. residency, to 10 years in prison and a $4.2 million fine in 2016 after he was found guilty of collaborating against the state.

Zakka, an information technology expert, had been invited to Iran by a government official a year earlier, but then disappeared after attending a conference in Tehran.