Iranian forces are advising the fighters and Iraqi aircraft are providing airstrikes, he said.
Karim al-Nuri of the umbrella group for the militias, known as the Popular Mobilization Units, and Jaafar al-Husseini, a spokesman for unit member the Hezbollah Brigades, said Sunday that a total of some 15,000 Shiite fighters were participating in the battle.
Numbers are expected to soar as Iraqi forces close in on the city, which is home to more than a million people.
Speaking in the village of Ain Nasir in the semi-arid land west of the Tigris, Amiri said the fight against Islamic State insurgents holding Mosul, who have already launched waves of suicide vehicle bombs, roadside bombs and sniper attacks to slow down the advancing forces, could be long and bloody.
An Iraqi military statement later said al-Shura was under full control of the security forces.
Their aim is to take over the town of Tal Afar, about 35 miles west of Mosul, to cut off the Islamic State from using it as a place to retreat or get reinforcement from Syria. They said that the two pilots of the helicopter, which went down the previous evening, were missing.
Barzani presumably made this announcement to assuage fears of Iraqi Arabs that the KRG would take advantage of the campaign against Daesh to annex Mosul or parts of Mosul to Iraqi Kurdistan, as they annexed Kirkuk province in 2014.
The operation will target Tal Afar, an Islamic State-held area close to Turkey where a sizeable ethnic Turkmen population lives, which could cause concern in Ankara.
"There is cooperation between. the Army, federal police, Hashid and counter-terrorism [forces] and also the [local Sunni] tribes", said Hadi al-Amiri, head of the Badr Organisation, the most powerful group within the Popular Mobilisation forces.
The Iran-backed and battle-hardened paramilitaries bring additional firepower to the almost two-week-old campaign to recapture Iraq's second largest city from the jihadi group.
Assadi said the operation aimed to retake the towns of Hatra and Tal Abta as well as Tal Afar, Assadi said.
Turkish President Recep Tayyip Erdogan on Saturday warned Shiite militias in Iraq against attacking Turkmen residents of Tal Afar, a town near the Islamic State group's Mosul bastion.
By the Fallujah offensive that ended in June 2016, the Shiite militias were kept out of the Sunni city, but were tasked with capturing some outlying towns and oversaw a controversial vetting process of those Sunnis trying to flee for safety, in a bid to catch escaping IS fighters.
The blasts mainly targeted neighborhoods in Baghdad that are predominately Shiite, which make up Iraq's majority. But Tal Afar, where the militias are now focused, is itself a risky flash point, analysts have said.
The government and the PMF say a limited number of violations have occurred and that they were investigated but they deny that abuses were widespread and systematic.
There have been other reports over the past week of civilians being killed as ISIS tries to herd people into its last major stronghold in Iraq and the nation's second city against the Iraqi-led operation.
Ironically, McMullin has more political experience than Trump, who's never worked in government and never run in any election. He is polling in the high 20's or low 30's, approximately even with Trump and with Democrat Hillary Clinton.
Kicker Wil Litz added his fourth goal of the game, a 41-yarder with 1:57 to play, to provide the final margin. The New Orleans Saints rallied to defeat the Seattle Seahawks 25-20 Sunday at the Mercedes-Benz Superdome.
We could have scored goals, we had the same amount of possession - and nearly the same amount of goalscoring opportunities. Old Trafford: Manchester City manager Pep Guardiola says he would rather quit than change his footballing philosophy.
OPEC representatives at the meetings were from Saudi Arabia, Kuwait, Qatar, United Arab Emirates and Bahrain. Iraq has said it would not participate, while Indonesia's state oil firm is targeting an output increase.
Terminal 5 was originally approved with Heathrow promising these slots but they never materialised and we were left without. Essex County Council has welcomed the plans and is calling on the Government to start the process quickly.
Tesla will have to beat the pace of those third-quarter deliveries if it wants to make its guidance for the full year. Immediately following the announcement, the company's shares rose almost 5 percent to $212.in after-hours trading.
Militia commanders have said that their forces will not enter Mosul but will instead focus on surrounding towns like Tel Afar. The militias have been accused of systematic abuses against Sunnis, whom the militias view as sympathizers of Islamic State.
This year marks a whole century of the daylights savings system, which was first introduced in the First World War. It also has mental health benefits, lighter evenings could help alleviate symptoms of Seasonal Affective Disorder.
Even though the new vote is expected to be approved by a large majority, it may still allow countries to revisit their vote. The UN body also on Tuesday adopted a separate, less controversial resolution on schools in Palestinian territories.
After two weeks of picking against the Irish, I have a feeling they're due - just as Stanford was two weeks ago in South Bend . It was Murphy's Law in South Bend for the Hurricanes. "You have to come out with a little more control", McGlinchey said.
Doctor Strange review: when pretty weird is not weird enough
In short, Doctor Strange has more important things to worry about than the innocence of Bucky Barnes and the Sokovia Accords. The other night, I watched a movie about a selfish, devil-may-care genius who suddenly ends up injured and helpless.
Sanders urges government to kill AT&T-Time Warner merger
AT&T would love to avoid an FCC review, which in the past has killed deals such as AT&T /T-Mobile and Comcast/Time Warner Cable . HBO and HBO Latin America have a combined seven licenses, and Turner Broadcasting System has 14 licenses.
Icelandic voters to choose between Pirates and establishment
The centre Regeneration Party, which could be the kingmakers in the election, garnered seven seats in the Icelandic parliament. REYKJAVIK , Iceland (AP) - There was no Pirate takeover, but the upstart party managed to make waves in Iceland.
Trump hits 'corrupt' Hillary Clinton; Mrs. Obama hugs her
Taking the podium, Obama hailed Clinton "for her leadership, for her courage and for what she is going to do for this country". Michelle Obama's approval ratings actually increased by 6 percentage points after her Democratic National Convention speech.
Greens wants new Ross Sea zone policed
The 25-member commission which reached the proposal includes the United States, China, Russia and the European Union. Scientists believe that the marine park can be a platform for a deeper understanding of climate change impacts.