BAGHDAD, Iraq (AP) -- The leader of al Qaeda in Iraq, Abu Ayyub al-Masri, was arrested in the northern city of Mosul, the Iraqi Defense Ministry spokesman said Thursday.
Abu Ayyub al-Masri took over al Qaeda in Iraq after Abu Musab al-Zarqawi was killed in 2006.
CNN is working to confirm the information.
Defense Ministry spokesman Mohammed al-Askari said the arrest of al-Masri, also known as Abu Hamza al-Muhajir, was confirmed to him by the Iraqi commander of the province.
"The commander of Ninevah military operations informed me that Iraqi troops captured Abu Hamza al-Muhajir the leader of al Qaeda in Iraq," al-Askari told The Associated Press by telephone.
Al-Masri, an Egyptian militant, took over al Qaeda in Iraq after Abu Musab al-Zarqawi was killed June 7, 2006 in a U.S. airstrike northeast of Baghdad.
The U.S. military in Baghdad said "we are currently checking with Iraqi authorities to confirm the accuracy of this information."
Interior Ministry spokesman Maj. Gen. Abdul-Karim Khalaf said that Mosul police "arrested one of al Qaeda's leaders at midnight and during the primary investigations he admitted that he is Abu Hamza Al-Muhajir." Watch a profile of al-Masri from the CNN archives »
News of the arrest was also reported by Iraqi state television.
The state channel, Iraqiya, said that Minister of Interior Jawad al-Bolani would reward Mosul police for the capture.
Interior Ministry spokesman Khalaf told the station by phone that a source close to the al Qaeda leader informed Mosul police that al-Masri would be at a house in the city's Wadi Hajar area at midnight Wednesday.
"The police raided this house and arrested him. During the primary investigation, he confessed that he is Abu Hamza Al-Muhajir, the leader of al Qaeda in Iraq. Now a broader investigation of him is being conducted," he said to Iraqiya.
If confirmed, the arrest would represent a major blow to al Qaeda in Iraq, which has been on the run for the past year following an influx of thousands of U.S. troops and a shift in alliances by Sunni tribesmen in western Anbar province, and elsewhere.
The U.S. military considers the organization its number one enemy in Iraq.
He did not have any further details nor did he say when the al Qaeda leader was arrested. According to unconfirmed reports he was caught Thursday evening in the Tayran area in central Mosul, 360 kilometers (225 miles) northwest of Baghdad.
Mosul is currently a major battleground for U.S. forces and al Qaeda.
The Islamic State of Iraq, an umbrella organization that includes al-Qaeda in Iraq, last year announced an "Islamic Cabinet" for Iraq and named al-Masri as "minister of war."
U.S. officials said al-Masri joined an extremist group led by al Qaeda's No.2 official in 1982. He joined al-Qaeda training camps in Afghanistan in 1999 and trained as a car bombing expert before traveling to Iraq after the U.S.-led invasion in 2003.
According to associates in Afghanistan, al-Masri has been involved in Islamic extremist movements since 1982, when he joined Islamic Jihad, a terror group led by Ayman al-Zawahri, who became bin Laden's chief deputy.
Al-Masri fought with Muslim rebels against the Soviets in Afghanistan in the 1980s and later ran al Qaeda training camps there.
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All About Al Qaeda in Iraq
An Iraqi Defense Ministry spokesman said that the leader of al-Qaeda in Iraq, Abu Ayyub al-Masri, was arrested Thursday. Al-Masri, also known as Abu Hamza al-Muhajir, was reportedly arrested in the northern city of  Mosul, 225 miles northwest of Baghdad.


There has been no official confirmation or comment from United States forces yet, but news of the arrest was reported on Iraq state television. 

The Iraqi Defense Ministry spokesman, Mohammed al-Askari, told the Associated Press via telephone that, "The commander of Ninevah military operations informed me that Iraqi troops captured Abu Hamza al-Muhajir the leader of al Qaeda in Iraq."

Al-Masri, an Egyptian-born militant, took control of Al Qaeda operations in Iraq after former leader Abu Musab al-Zarqawi was killed on June 7, 2006 in an airstrike northeast of Baghdad.

Major Gen. Abdul-Karim Khalaf, an Interior Ministry spokesman, said that police in Mosul "arrested one of al Qaeda's leaders at midnight and during the primary investigations he admitted that he is Abu Hamza Al-Muhajir. Now a broader investigation of him is being conducted."