Choose the sniper weapon set and set blue and red team with green weapon.Make sure which is leader in the room; he may wear a green or blue turban (randomized). Use the sniper to shoot the leader first. The remaining suspect will stick with hostage, but this isn't a problem. Ready your member to breach (boom) the door, and also ready your sniper. Kill the two remaining suspects when the hostages are startled by the entry (as they duck out of the way).