A Libyan delegation visited Beirut this week seeking to restart talks over the fate of a Lebanese cleric who has been missing in Libya for decades and the release of Muammar Gaddafi’s son which has been held in Lebanon for years.

The talks aim to reactivate a dormant agreement between Lebanon and Libya since 2014, under which the two countries cooperated in investigating the disappearance of the Shia cleric Musa al-Sadr in 1978.

The cleric’s fate remains a long-standing vexed issue in Lebanon. The cleric’s family believe he may still be alive in a Libyan prison, although most Lebanese consider al-Sadr, who would have been 94 years old now, to be dead.

Muammar Gaddafi’s son, Hannibal Gaddafi, detained in Lebanon since 2015, after his abduction from neighboring Syria, where he was living as a political refugee. He was kidnapped by Lebanese activists demanding information on the fate of al-Sadr.

Lebanese authorities released him from the kidnappers, but then imprisoned him, accusing him of withholding information about al-Sadr’s disappearance.

Hannibal Gaddafi – who was two years old at the time of Sadr’s disappearance – claims to be the victim of an injustice and claims he is being blamed for something he did not do.

A lawyer familiar with the case said the delegation left Beirut after spending several days in Lebanon, where they met with the justice minister and a judge heading a commission investigating al-Sadr’s disappearance.

The official described the talks as “positive” but did not elaborate or say whether they had achieved any results. The delegation is expected to return next week, he said, adding that Lebanese and Libyan authorities are treating the two cases as separate. He said there was “no agreement” so far on Gaddafi’s release.