SAMEER N. YACOUB
BAGHDAD (AP) -- Islamic militants who seized cities and towns vowed Thursday to march on Baghdad to settle old scores, joined by Saddam Hussein-era loyalists and other disaffected Sunnis capitalizing on the government's political paralysis over the biggest threat to Iraq's stability since the U.S. withdrawal.
Trumpeting their victory, the militants also declared they would impose Shariah law in Mosul and other areas they have captured.
In northern Iraq, Kurdish security forces moved to fill the power vacuum -- taking over an air base and other posts abandoned by the military in the ethnically mixed city of Kirkuk. The move further raised concern the country could end up partitioned into Sunni, Shiite and Kurdish zones.
Three planeloads of Americans were being evacuated from a major Iraqi air base in Sunni territory north of Baghdad, U.S. officials said, and Germany urged its citizens to immediately leave parts of Iraq, including Baghdad.
President Barack Obama said Iraq will need more help from the United States, but he did not specify what it would be willing to provide. Senior U.S. officials who spoke on condition of anonymity because they were not authorized to discuss the matter by name said Washington is considering whether to conduct drone missions in Iraq.
The U.N. Security Council met on the crisis, underscoring the growing international alarm over the stunning advances by fighters from the militant group known as the Islamic State of Iraq and the Levant.
Russia's U.N. Ambassador Vitaly Churkin, the council president, said the U.N. envoy in Iraq, Nickolay Mladenov, told members by videoconference that "there is no immediate danger of the violence spreading to Baghdad" -- that the city "is well protected and the government is in control."
Prime Minister Nouri al-Maliki had asked parliament to declare a state of emergency that would give him and his Shiite-led government increased powers to run the country, but the lawmakers failed to assemble a quorum.
The Islamic State, whose Sunni fighters have captured large swaths of territory in Iraq and Syria, aims to create an Islamic emirate spanning both sides of the border. It has pushed deep into parts of Iraq's Sunni heartland once controlled by U.S. forces because police and military forces melted away after relatively brief clashes, including in Iraq's second-largest city of Mosul.
Skirmishes continued in several areas. Two communities near Tikirt -- the key oil refining center of Beiji and the city of Samarra, home to a prominent Shiite shrine -- remained in government hands, according to Iraqi intelligence officials. The price of oil jumped to above $106 a barrel as the insurgency raised the risk of disruptions to supplies.
In its statement, the Islamic State declared it would start implementing its strict version of Shariah law in Mosul and other regions it had overrun. It said women should stay in their homes for modesty reasons, warned it would cut off the hands of thieves, and told residents to attend daily prayers. It said Sunnis in the military and police should abandon their posts and "repent" or else "face only death."
The Islamic State's spokesman vowed to take the fight into Baghdad. In a sign of the group's confidence, he even boasted that its fighters will take the southern Shiite cities of Karbala and Najaf, which hold two of the holiest shrines for Shiite Muslims.
"We will march toward Baghdad because we have an account to settle there," he said in an audio recording posted on militant websites commonly used by the group. The statement could not be independently verified.
Baghdad does not appear to be in imminent danger of a similar assault, although Sunni insurgents have stepped up car bombings and suicide attacks in the capital recently.
While ISIL fighters gained the most attention in this week's swift advances, it was increasingly clear that other Sunnis were joining the uprising.
Several militant groups posted photos on social media purporting to show Iraqi military hardware captured by their own fighters, suggesting a broader-based rebellion like that in neighboring Syria.
In Saddam's hometown of Tikrit, overrun by militants Wednesday, witnesses said fighters raised posters of the late dictator and Izzat Ibrahim al-Douri, his former deputy who escaped the 2003 U.S.-led invasion and eluded security forces ever since.
Fighters loyal to his Naqshabandi Army as well as former members of Saddam's Baath Party were the main militant force in Tikrit on Thursday, said a resident who identified himself by his nickname, Abu Mohammed, out of concern for his safety. He said about 300 soldiers surrendered near the governor's office -- a spectacle captured in multiple amateur videos posted online.