BAGHDAD — Sunni militants spilling over the border from Syria seized control Tuesday of the northern city of Mosul, Iraq’s second largest, in the most stunning success yet in a rapidly widening insurgency that threatens to drag the region into war.
Having consolidated control over Sunni-dominated Nineveh province, armed gunmen were heading on the main road to Baghdad, Iraqi officials said, and had already taken over parts of Salahuddin province. Thousands of civilians fled south toward Baghdad and east toward the autonomous region of Kurdistan, where security is maintained by a fiercely loyal army, the peshmerga.
The Iraqi army apparently crumbled in the face of the militant assault, as soldiers dropped their weapons, shed their uniforms for civilian clothes, and blended in with the fleeing masses. The militants freed thousands of prisoners and took over military bases, police stations, banks, and provincial headquarters, before raising the black flag of the jihadi group Islamic State of Iraq and the Levant over public buildings. The bodies of soldiers, police officers, and civilians lay scattered in the streets.
“They took control of everything, and they are everywhere,” said one soldier who fled the city, and gave only his first name, Haidar.
The swift capture of large areas of the city by militants aligned with the jihadi group represented a climactic moment on a long trajectory of Iraq’s unraveling since the withdrawal of US forces at the end of 2011.
The rising insurgency in Iraq seemed likely to add to the foreign policy woes of the Obama administration, which has faced sharp criticism for its swap of five Taliban officers for Sergeant Bowe Bergdahl and now must answer questions about the death of five Americans by friendly fire in Afghanistan on Monday night.
Critics have long warned that America’s withdrawal of troops from Iraq, without leaving even a token force, invited an insurgent revival. The apparent role of the Islamic State of Iraq and the Levant in Tuesday’s attack helps vindicate those, among them the former ambassador to Syria, Robert Ford, who have called for arming more moderate groups in the Syrian conflict.
Prime Minister Nouri al-Maliki ordered a state of emergency for the entire country and called on friendly governments for help, without mentioning the United States specifically.
In Washington, the State Department spokeswoman, Jen Psaki, said in a statement that the United States was “deeply concerned about the events that have transpired in Mosul,” and that the Obama administration supported a “strong, coordinated response to push back this aggression.” The statement said the administration would provide “all appropriate assistance to the government of Iraq” and called the Islamic State of Iraq and the Levant “not only a threat to the stability of Iraq, but a threat to the entire region.”
Mosul was the last major urban area to be pacified by American troops and, when they left, the United States contended that Iraq was on the path to peace and democracy.
Even as insurgents consolidated control of Mosul and surrounding Nineveh province on Tuesday, they looked to other targets. They cut off a portion of the main highway that links the city with Baghdad, the capital, and secured villages near Kirkuk, a major city that is in dispute between Arabs and Kurds, according to security officials.
For more than six months, the militants have maintained control of Fallujah, in Iraq’s Sunni-Arab Anbar province, a city where hundreds of Americans died trying to crush an insurgency. While Fallujah carries symbolic importance to the United States, the seizure of Mosul, a city of 1.4 million with a mix of ethnicities, sects, and religions, is more ominous for the stability of Iraq.
“It’s a shock,” said James Jeffrey, a former US ambassador to Iraq. “It’s extremely serious. It’s far more serious than Fallujah.”
Mosul is a transportation hub for goods coming from Turkey and elsewhere. An important oil pipeline is nearby, carrying nearly 15 percent of the country’s oil flow to a port on the Turkish coast.
The chaos in Mosul also illustrated how the violence in Iraq has increasingly merged with the civil war in Syria, as extremists now operate on both sides of the porous border. On Tuesday, local officials claimed that many of the fighters were jihadists who had come from the lawless frontier that divides Iraq and Syria, a region where they have increasingly operated with impunity even as President Bashar Assad has reclaimed ground lost to the insurgents elsewhere in Syria.
Osama al-Nujaifi, the Iraqi Parliament speaker, a Sunni from Mosul, called the fighting a “foreign invasion of Iraq, carried out by terrorist groups from different countries.”
The rout in Mosul was a humiliating defeat for Iraq’s security forces, led by Maliki and his Shi’ite-dominated government and equipped and trained by the United States at a cost of billions. As the insurgency has gained strength over the last year, Maliki has been criticized for pursuing security policies that alienated ordinary Sunnis, such as sweeps that rounded up hundreds of men, innocent and guilty alike, and the arrest of the wives of suspected militants.
Referring to the security forces in Mosul, Jeffrey, now a visiting fellow at the Washington Institute for Near East Policy, said, “they had lost the support of the people because they had a sectarian policy, and I saw it with my own eyes.”