(Radio Iowa) – A specially-trained urban search-and-rescue team, from bases in Cedar Rapids and Sioux City, is working to secure the Davenport apartment building that partly collapsed Sunday. It’s feared the six-story structure could completely cave in at any time, hampering efforts to search the rubble for bodies. Chief Rick Halleran, director of Iowa Task Force One, says they have about 50 team members on site who’ve been carefully going room-to-room.

Dozens of tenants were evacuated after the collapse, some with serious injuries, including one woman who had to have a leg amputated. Three residents of the building remain unaccounted for and officials refused to say if search dogs — or rescuers — had found any human remains. A reporter asked Halleran how the team goes about conducting its searches inside such a dangerous, shaky building.

Some of the shoring was done by the team, but other exterior shoring will need the help of various utility crews. It’s unclear how long the process may take and no timeline was provided. Davenport Fire Chief Mike Carlson was asked why Iowa Task Force One wasn’t brought in sooner.

The owner of the apartment building is being fined nearly 400 dollars by the city for failure to maintain the building’s structural integrity. Also, Trishna Pradhan, Davenport’s chief building inspector — has resigned.