 Cook County officers were assisted by colleagues from surrounding suburbs, and a task force devoted solely to locating the sisters was formed, with the ground search initiated on December 29 being bolstered by hundreds of local volunteers.Police conducted door-to-door canvassing throughout Brighton Park, and numerous canals and rivers were dredged.In addition, more than 15,000 flyers were distributed to local homes, and parishioners of the sisters' church offered a $1,000 reward for information leading to their whereabouts.