(Portland, OR)  --  Police are seeking the public's help in their search for two teenage girls accused of pepper-spraying a Safeway employee after trying to shoplift from the store.  The Portland Police Bureau released a surveillance photo of the two girls yesterday.  Police say they tried to steal more than one-thousand-dollars' worth of personal care items from a Safeway in late April before store employees caught them and asked them to leave.  The teens then began threatening store employees before pepper-spraying a store manager outside the Safeway.  Police say they fled the scene in a white Kia.