Not sure who had the guns in this latest item to catch international attention, but NPR (Public Broadcasting in the USA) cited UN observers as attributing the massacre to "rogue militia" rather than regular forces.
Torygraph:
Syrian army 'using children as human shields'
Syrian troops are using children as young as nine-years-old as human shields, forcing them to ride on top of government tanks to deter opposition attacks, the UN has stated.