Islamic State group fighters, who took control of large sections of Iraq this year, regularly target Shi'ite districts in Baghdad.
Turkey will use its own intelligence program to select and screen fighters.
Three car bombings in Baghdad and a suicide attack on the city's outskirts could presage a larger struggle for Iraq's capital.
Two suicide attacks left at least 11 people dead and dozens wounded.
The U.K. previously raised its threat level to "severe" as authorities believe more than 500 Britons have joined ISIS or al Qaeda.
An Iraqi provincial official expressed fear the strategic Iraqi province of Anbar could "fall in 10 days."
Family members of an Iraqi cameraman in Samra said he was executed by the Islamic State.
Islamic State group militants are aiming to consolidate land in Anbar province to launch an attack on Baghdad.
U.N. envoy Staffan de Mistura said Kobani could suffer the same fate as the Bosnian town of Srebrenica, where 8,000 Muslims were murdered by Serbs in 1995.
“If we don’t put boots on the ground, we can’t form the coalition, we can’t retake ground that needs to be taken and held."
About 500 people are stranded in Kobani, with thousands more nearby. The U.N. is warning that they “will be most likely massacred” by ISIS.
In a new video, the Islamic State warns it will "conquer" Turkey and calls President Erdogan "Caliph of the Muslim Brotherhood."
As Kurdish forces battle ISIS in Kobane, Turkey's Kurds are protesting their own government in solidarity with kinsmen across the border.
The U.S. drone campaign in Yemen is helping beat the Islamic State group in Syria and Iraq.
Across Turkey, at least 21 people have been killed in clashes as pro-Kurdish demonstrators protested over the country's inaction against ISIS.
"I do feel bad that so many people don't have a sense of humor," said South Dakota state Rep. Betty Olson.
Kevin Spacey's character was inspired by real-life events.
The incident has enhanced concerns about the future of U.S.-led airstrikes against the Islamic State group in Iraq and Syria.
The former president criticized President Barack Obama's handling of ISIS and his Middle East foreign policy in general.
The four men, who had been under surveillance by MI5 for quite some time, were arrested from west and central London on Tuesday.
The company is already investigating alleged bribery in a number of Middle East countries, as well as Poland.
Abbott says if Australians want to say stupid things, fine, but there's no reason to import "troublemakers."