(Burns, OR)  --  Cleanup continues at the visitors' center at the Malheur National Wildlife Refuge, after the 41-day occupation by armed activists that ended last month.  Photos taken of the compound following the occupation were released yesterday, showing garbage strewn in offices, damaged equipment, and a trench on the refuge grounds that had been dug with an excavator and contained human waste.  Officials say the plumbing at the compound was clogged, and there's currently no running water or functioning toilets.  Crews are working to get the visitors' center re-opened by early this summer.