The case of Nizar Zakka, who has been detained Iran since 2015, is about to end as Lebanon's General Security chief, Abbas Ibrahim, left for Tehran on Sunday in order to bring the Lebanese national back home.

Knowledgeable sources told Asharq Al-Awsat newspaper that talks were over and measures for Zakka’s release from prison were being prepared, expecting the process to take between 24 and 48 hours.

Zakka’s attorney, Majed Dimashqieh, said that his client was set to arrive in Beirut within hours, stressing that Zakka’s release “was the result of concerted efforts by Lebanese officials, headed by Aoun and Prime Minister Saad Hariri…in addition to General Ibrahim.”

Iran 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 Teheran.