Iraqi Prime Minister Mustafa Al-Qadimi said on Twitter on Monday that ISIS leader Sami Jasim al-Jaburi, known as the former deputy of former ISIS chief Abu Bakr al-Baghdadi, was captured in an Iraqi intelligence operation outside the Iraqi border.

Without specifying where the ISIS mercenary was captured, Al-Qadimi added that the capture coincided with the early elections held on Sunday, "where the heroes of the security forces guarded the elections."

However, Al-Qadimi told AFP that a senior Iraqi military official was detained "in Turkey", without providing further details about the location and circumstances of the operation.

There was no reaction from the Turkish state, which sheltered ISIS mercenaries, to this information.

According to a statement from Iraqi security forces, Sami Casim al-Jaburi is "one of the most wanted jihadists internationally, and is considered one of the closest people to Abu Ibrahim al-Hashimi al-Qourachi, the current head of ISIS." He is presented as responsible for the financial and economic files of the Islamic State.

Sami Casim al-Jaburi was ISIS's "head of the sharia council and second-in-command in Mosul, in southern Iraq" weeks after Abu Bakr al-Baghdadi was declared the "Caliph" in 2014.

The group leader, al-Jaburi, reportedly served as the "deputy" of ISIS in southern Mosul, while also serving as ISIS's finance minister, overseeing the group's revenue-generating operations from illegal oil, gas, antiques and mineral sales. Al-Jaburi sought to turn oil into a new flow of funds for the group.

A reward of five million dollars was promised for any information about Sami Casim al-Jaburi, who played an important role in the management of ISIS's finances by the counter-terrorism program of the US Department of State. In 2015, he was added to the US government's specially designated global terrorist list.