OMAHA —  Police are investigating two early morning robberies at Omaha convenience stores.  Police say an employee at the Bucky’s at 40th and Dodge says someone entered the store with a gun around 12:40, jumped over the counter, and demanded money.  The suspect then took cash, hit the employee with the gun, and ran away.  Another robbery was reported at the Bucky’s at 60th and Center just before seven o’clock.  The details of that case are still under investigation.