Fond du Lac police are investigating two abandoned homeless camps discovered this week. Police officers found materials used to make shelters and old mattresses in a wooded area at the dead ends of Monmouth and Vermont streets in Fond du Lac. Last October, a homeless camp was found in a wooded area on Alliant Energy property. Police say there are homeless shelters available in Fond du Lac through the Solutions Center and the Salvation Army also has a warming shelter for people who need a place to sleep.