Youngsters had previously been encouraged to train on weapons and IS even changed text books to reflect its military ideology.
Eid prayers were allowed under ISIS but festivities were not.
"This attack shows that they will soon be defeated in Mosul".
The almost 800-year-old mosque and the famous leaning al-Hadba minaret stood as a symbol of faith and unity for the people of Mosul, he said, noting that ISIS attempted to undermine this by using "the mosque to publicly justify its criminal campaign of genocide, mass rape, slavery and murder".
Eid al Fitr 2017 in Mosul will be remembered as a day of freedom for the tormented population, the first after three years of despotic rule by Isis (Islamic State).
"It was the last icon for the historic city of Mosul and a valuable symbol", he said.
The Iraqi Response Force had surrounded ISIS in the northern side of Shifa neighborhood after the southern part and the fifth bridge on the right bank of the Tigris River were reclaimed by the army's 9th division forces, Rasool detailed.
Al-Khodari told The Associated Press that IS sleeper cells set fire to houses and cars on Sunday afternoon in the Tanak neighborhood on Mosul's far western edge.
ISIS launched a wave of attacks late on Sunday, trying to take control of a district west of the Old City, Hay al-Tanak, and the nearby Yarmuk neighbourhood.
Rasoul described blowing up the two historical Mosul sites "as blowing up the history" and said the group "added another crime against humanity" and world heritage.
"As our Iraqi Security Force partners closed in on the al-Nuri mosque, ISIS destroyed one of Mosul and Iraq's great treasures", said Maj.
The offensive to retake Mosul, in northern Iraq, was launched eight months ago with air and ground support from a US-led worldwide coalition.
Iraqi forces have made significant progress this past week in its fight to liberate western Mosul, Iraq, from Islamic State of Iraq and Syria control, said Army Col. Ryan Dillon, spokesman for Combined Joint Task Force Operation Inherent Resolve.
More than 15 Isil fighters were killed, as well as several civilians. "It lost its fighting spirit and its balance".
The urban-warfare forces were leading the campaign to clear the Sunni Islamist militants from the maze of Old City alleyways, moving on foot house-to-house in locations too cramped for the use of armoured combat vehicles.
The battle headed toward the heart of Mosul City is still ongoing, with Iraqi government troops intending to open routes for escape for the many civilians who are still trapped in the area.