American troops have increased the number of raids they conduct in cooperation with the Iraqi police. While this leads to rounding up more anti-government fighters, it also exposes American troops to more danger from roadside bombs. The bombers have found that, if the Americans do not have an opportunity to carefully scout a route, they could plant a well concealed bomb and have a good chance of setting it off when American vehicles got near. Unscouted routes are more common for raids, as they are often in neighborhoods that American troops do not visit frequently. Working closely with the growing number of Iraqi police detectives also risks getting involved with those few Iraqi police who are working (because of belief or bribes) with anti-government forces or terrorists.