A U.S. Special Operations assault force captured an ISIS operative during a recent raid in northern Iraq, a U.S. official confirmed to Fox News on Tuesday.

The official would not discuss specifics of the raid, including the identity of the captured militant, due to the sensitivity of the mission. The operation was first reported on by CNN. A report in The New York Times described the operative as a “significant” member of the terror group.

In December, Defense Secretary Ash Carter announced that a special operations task force was headed to Iraq. Fox learned the 200-man unit, which included an assault force, intelligence cell and aviation element would be based in Irbil in northern Iraq.

In October, Army Master Sgt. Joshua Wheeler, a Delta Force Commando, was killed during a mission to rescue of dozens of mostly Kurdish prisoners held by ISIS in northern Iraq.

In May, a Delta Force raid in eastern Syria resulted in the death of an ISIS commander, Abu Sayyaf, and the detention of his wife Umm. U.S. forces hope to gather evidence about the terror group’s operations from its latest captive, as it did in the case of Umm Sayyaf.

Umm Sayyaf remains held by the Kurdistan Regional Government in Iraq. She was charged last month by the Justice Department with being part of a conspiracy resulting in the death of Kayla Mueller, a 26-year-old American aid worker kidnapped by ISIS.

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