The U.S. Army’s elite Delta Force operations to target, capture or kill top ISIS operatives are on the verge of beginning in Iraq, after several weeks of covert preparation, an administration official with direct knowledge of the force’s activities told CNN.

The official said the group has spent the last several weeks preparing, including setting up safe houses, establishing informant networks and coordinating operations with Iraqi and Peshmerga units. It’s the same strategy that Special Operations forces have used in previous deployments to combat zones.

Several Pentagon and military officials declined to discuss specifics of the so-called expeditionary targeting force with CNN.