BAGHDAD, Iraq (CNN) -- Al Qaeda's No. 2 operative in , Hamed Juma Faris al-Suaidi, has been arrested, the U.S. military and Iraq's national security adviser announced Sunday. Al-Suaidi, also known as Abu Rana and Abu Humam, is said to be second in command in the terrorist group al Qaeda in Iraq, behind Abu Ayyub al-Masri. Al-Masri succeeded Abu Musab al-Zarqawi after he was killed during a U.S. airstrike in June. "This is a very important development," Iraq's Planning Minister Barham Salih told CNN.