The Qayyarah bridge is the only crossing along the Tigris that connects Mosul and Baghdad. Since being occupied by Iraqi military, ISIL fighters have been trying to destroy the military bridge that now span across the river. In order to achieve that, they packed explosives into tree trunks and a refrigerator and float them down from upstream in an attempt to blow up bridge.
By U.S. Navy photo by Photographer’s Mate 1st Class Aaron Ansarov [Public domain], via Wikimedia Commons