As Iraqi forces increased their offensive in order to reclaim the city, the militants moved south to Hawija, Kirkuk, according to local media Alsumaria News.
A local source has insisted, senior jihadi militants fled Mosul, and ordered curfews on specific roads which enabled them to flee the city.
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The source added: "Hawija has now become the group’s main haven, with members split between Hawija and Tal Afar an Baaj (west of Nineveh)."
The four sub-ISIS networks of Nineveh, Dijlah, Salahuddin and Diyala all made the dramatic getaway to Kirkuk.
The news comes after a British special forces sniper shot an ISIS jihadi dead from almost 1.5 miles away.
Islamic State jihadis have moved their headquarters to flee from aggressive coalition forces
Hawija has now become the group’s main haven
A local source
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The SAS sniper used one of the world's most powerful rifles to kill the militant, after he witnessed the terrorist callously shoot his own colleague.
A source told the Daily Star on Sunday: “It was a classic counter-sniper operation. The ISIS gunman was moving all the time to get into the best position to get a kill.
“It was like a game of cat-and-mouse and at one point the SAS almost gave up, believing that the terrorist had gone to ground.
Members of the Iraqi forces take position in a neighbourhood of west Mosul
Iraqi forces charge through west Mosul in a bid to reclaim it from the terror network
“Just as the light was beginning to fade the gunman moved into what he thought was a safe location and lifted his rifle up into his shoulder before the SAS shot him dead.”
Yesterday, US coalition forces hammered the terror network with 27 air strikes hours after a depraved suicide bomber killed 22 people and injured more than 100 others at Manchester Arena.