The ISIL terrorists had gathered to take important decisions as they are losing the war against the Iraqi army and volunteer forces (Hashd al Shaabi).
Several other senior ISIL terrorists were also killed when the terrorists' largest bomb-making factory was hit in another region of Nineveh province.
A number of ISIL Chechen commanders were among the terrorists killed in bomb-making factory.
Earlier on Wednesday, Local sources in Nineveh province disclosed that unidentified assailants have gunned down 34 terrorists in three separate attacks in the Eastern parts of the city of Mosul.
The unknown gunmen killed the ISIL terrorists with light BKC rifles by attacking their bases in al-Karama, Sana'e, and al Bak regions in Eastern Mosul city and fled the scene, the Arabic-language media quoted local sources as saying.
The assassination attempts against the ISIL terrorists have considerably increased after the liberation of Fallujah as the people's morale to confront the ISIL has boosted.
In a relevant development on Saturday, unidentified assailants gunned down two terrorists in Mosul city center.
The unknown gunmen killed the ISIL terrorists with handguns equipped with silencers in Bab al-Sara market in Mosul city center.
Also in late May, masked armed men assassinated a senior ISIL commander in Salahuddin province in Northern Iraq.
Abu Abd al-Rahman al-Anbari and his bodyguard were killed in in the city of al-Sharqat by gunmen using handguns equipped with silencer, the Arabic-language Sumeria News quoted an unnamed security source as saying.
Abu Abd al-Rahman al-Anbari was in charge of ISIL's security in al Sharqat city.
Al-Sharqat has been under ISIL's control since June 2014.
In early May, the Iraqi army and popular forces continued their advances in Anbar province in Western Iraq, and killed over half a dozen ISIL terrorists, including one of their most wanted leaders.
Chief commander of the military operations in Anbar Ismail Mahlavi confirmed that senior ISIL commander Shaker Wahib al Fahdavi has been killed in an Iraqi army operation in the town of Rataba in the Western part of Anbar province.
Mahlavi added that seven other ISIL commanders were also killed in the Iraqi army's operations in Rataba town.
The confirmation by the Iraqi army comes while Fahdavi was reported dead eight times before.
The Iraqi army, meantime, announced that ISIL's war strategist was killed in the village of al-Asouja in Makhmour region in Nineveh province; FNA reported.
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