BAGHDAD (AP) — The U.S. military said it has detained four suspected insurgents in raids targeting al-Qaida in Iraq’s leadership in the northern Iraqi city of Mosul.

The military said one of two men detained in raids Wednesday is believed to have been linked with a terrorist killed in Mosul on Oct. 5.

That was the day the military said it killed five insurgents including Abu Qaswarah, the No. 2 leader of al-Qaida in Iraq.

The military said two more suspects were detained today in Mosul. The city remains restive despite recent security gains.

Military officials say Abu Qaswarah was a key figure in the al-Qaida network with ties to the movement’s global leadership in Pakistan and Afghanistan, where he trained.