Paramedics were called to the gym at Palolo Valley District Park yesterday where 15 elementary-age students were exposed to pepper spray.  It was 9:15 a.m. yesterday and the students were part of the Palolo city summer program.  Police officers were making a presentation when the coughing began.  The gym was evacuated and the students were treated.  It turns out one of the children brought the pepper spray to the event.  There were no arrests. The children were reported in stable condition.