Horsham Police and the township fire marshal’s office are investigating three suspicious fires over the last two weekends. The first one broke out late at night on Saturday, September 18, in a dumpster behind Keith Valley Middle School.  The second one was a week later, on Saturday, September 25 in a basket of clothes in a laundry room at the Blair Mill Village Apartments.  The third one was a short time later in a shed behind the Horsham Bible Church, across Upland Avenue from the middle school grounds.