AP - Iraqi Kurdish forces launched a new offensive Wednesday targeting Islamic State extremists as a suicide bomber killed at least five people in the Kurds' regional capital.

The operation came as Turkish President Recep Tayyip Erdogan said details haven't been finalized for a deal that would have his country train rebels to battle Islamic State militants in Syria, where the militants also hold territory.

A U.S.-led coalition is targeting Islamic State (also known as ISIS or ISIL) with airstrikes in Iraq and Syria, supporting Western-backed Syrian rebels, Kurdish fighters and the Iraqi military on the ground. The strikes have helped halt the extremists' move to take the Syrian city of Kobani near the Turkish border, and enabled Iraqi forces to make key advances. On Tuesday, the Kurds captured six ISIS-controlled buildings in Kobani and confiscated a large amount of weapons and ammunition, the Britain-based Syrian Observatory for Human Rights said.

In Iraq, the new offensive by Kurdish forces, known as the peshmerga, targeted areas in Diyala and Kirkuk provinces, said Jaber Yawer, a peshmerga spokesman. The ISIS extremists had seized the territory in their August offensive that saw them capture a third of Iraq.

In Diyala, the peshmerga worked with Iraqi security forces to retake the towns of Saadiya and Jalula, Yawer said. In Kirkuk, Kurdish forces backed by coalition airstrikes launched attacks to retake territory near the town of Kharbaroot, located 35 kilometers (22 miles) west of the city of Kirkuk.

The offensive began as a suicide car bomber struck in the heart of Irbil, killing at least five people, officials said. No group immediately claimed responsibility for the midday attack in the capital of the semi-autonomous Kurdish region, though authorities suspected the Islamic State group. Authorities also suspected ISIS in three Baghdad bombings that killed at least 10 people and wounded almost 30.

Turkey, while previously backing Syrian rebels fighting to topple Syrian President Bashar Assad, has been hesitant to aid the Kobani fight over its own fears about stoking Kurdish ambitions for an independent state. On Wednesday, Erdogan said no deal had been finalized for Turkey to train rebels under the auspices of the U.S.-led operation against Islamic State.

"If we only talk about train and equip, we would be lying to ourselves," Erdogan said, reiterating that overthrowing Assad must be a priority as well.

Retired Marine Gen. John Allen, the U.S. envoy for the international coalition, held talks with Turkish officials in Ankara on Wednesday but few details were released.

ISIS has declared a self-styled Islamic caliphate in areas under its control in Iraq and Syria, governing it according to its violent interpretation of Shariah law. The group has carried out mass killings targeting government security forces, ethnic minorities and others against it, including a video released Sunday with militants showing they beheaded American aid worker Peter Kassig.

Among those in that video were two French militants. On Monday, government officials identified 22-year-old Maxime Hauchard as one. Paris prosecutors said there was a "strong presumption" that Michael Dos Santos, 22, who like Hauchard left for Syria in August 2013, also was among them.

France said Wednesday it would send an additional six fighter jets to back the U.S.-led coalition. The jets will be deployed next month to Jordan, reducing the flying time to Iraq, said Col. Gilles Jaron, a French military spokesman.

France already has 12 aircraft taking part in strikes in Iraq.