ST. LOUIS (KMOX) – St. Louis Police are investigating two Friday night shootings that left two people injured.   Police say one man is in stable condition after he was shot in the back just after ten p.m. in the 25 hundred block of Ohio, just south of Fox Park.    The other shooting was shortly before eight p-m on Mount Pleasant at South Compton.  A 33-year-old man was shot in the stomach.  His condition has not been released.