Iranian Foreign Ministry spoekesman Bahram Qassemi ha said that Tehran is serious in pursuing the case of the kidnapped Shia Cleric Imam Musa al-Sadr.

“The case of Imam Musa al-Sadr is so important for the Iranian government that it has always been on its agenda,” Fars news agency quoted Qassemi as saying on Monday.

This comes months after thousands of people held a rally in Lebanon to mark the 38th anniversary of the kidnapping of Imam Musa al-Sadr during a visit to Libya.

Back in 2012, Libyan government announced that a series of documents belonging to the former regime of Libya suggest that the Iranian-born Shia cleric has been killed by Qaddafi regime.

“Based on the information discovered in Qaddafi regime's security office, Imam Musa al-Sadr and his friends were martyred by the suppressing forces of Qaddafi,” Libyan Government's Spokesman Nasser al-Manee told FNA at the time.

During Qaddafi’s reign, Libya consistently denied responsibility of the disappearance of Sadr, claiming he left Libya for Italy in 1978.

However, other sources, including top Iranian officials say he is still alive and being kept in a secret jail inside Libya.

Italy has also denied claims of Sadr arriving in the country.