MEDIA HADCANYON DEL ORO HIGH SCHOOL ONLOCKDOWN THIS AFTERNOON.ORO VALLEY POLICE TELL US --C-D-O OFFICIALS CALLED THEMAFTERLEARNING ABOUT A SNAPCHAT POST-- SHOWING A FORMER STUDENT WITHAGUN IN HIS WAISTBAND.THEY SAY -- HE APPEARED TO BE INA SCHOOL PARKING LOT.POLICE SAY -- THEY KNOW WHO THEFORMER STUDENT IS -- BUT HAVENOTBROUGHT HIM INTO CUSTODY.SERGEANT CARMEN TREVIZO - WITHORO VALLEY POLICE -- TOLD USEXACTLYWHAT GOES IN TO INVESTIGATING ATHREAT LIKE THIS.IC: IT BECOMES VERY PROBLEMATICOC: SAW THE INITIAL INCIDENT.STUDENTS WERE RELEASED TO THEIRPARENTS JUST BEFORE 7 TONIGHT.ORO VALLEY POLICE WILL HAVEEXTRA OFFICERS ON CAMPUS ATC-D-OTOMORROW -- AS A PRECAUTION.