Heavy fighting between the Islamic State of Iraq and the Levant and rival rebels has left more than 1,400 people dead across northern Syria since January 3. The clashes, which erupted after months of growing resentment against the Islamic State's heavy-handed tactics in the territory under its control, are the most serious among the opponents of Syrian President Bashar Assad since the country's civil war began.
A senior Iraqi intelligence official who specialises in al-Qaeda said Haji Bakr was assassinated in a killing tied to the dispute between the Islamic State and other armed opposition groups.
Haji Bakr supervised a series of attacks against hotels and embassies in Iraq in 2010, and headed the military council of al-Qaeda in Iraq after the group's then-leader, Abu Omar al-Baghdadi, was killed in 2010, the official said.
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Haji Bakr had almost no public profile before a few weeks ago as rumors spread that he had been killed.
"You could ask people within ISIS and they couldn't tell you," he said, using an acronym for the Islamic State. Also today, the international mission ridding Syria of its chemical weapons said a second batch of toxic chemicals has been removed from the country.
The United Nations and the Organization for the Prohibition of Chemical Weapons said in a joint statement that the materials were verified before being loaded onto Danish and Norwegian ships and taken out of the country.