>>> THE FIRST DAY OF SUMMER SCHOOL ON THE PENINSULA INTERRUPTED BY A SCARY INCIDENT. A STUDENT WAS STABBED DURING A FIGHT ON THE SAN MATEO HIGH CAMPUS. CHRISTIE SMITH SPOKE WITH STUDENTS AND PARENTS ABOUT THE TENSE MOMENTS ON CAMPUS. >> I'M SCARED. FIRST DAY OF SUMMER SCHOOL, WE'RE NOT FAMILIAR WITH THIS SCHOOL. >> Reporter: MICHELLE WEAVER PICKING UP HER DAUGHTER AFTER LEARNING A STUDENT HAD BEEN STABBED ON CAMPUS. IT HAS HER RETHINK SUMMER SCHOOL. >> I'M GOING TO CONTACT AND SEE IF WE CAN GO ONLINE. I'D RATHER MY DAUGHTER TAKE THE CLASS ONLINE. >> Reporter: POLICE WERE CALLED AFTER A STUDENT WAS STABBED DURING AN ON-CAMPUS FIGHT BETWEEN STUDENTS. THIS IS ONE OF SEVERAL CELL PHONE VIDEOS, BLURRED TO PROTECT THE STUDENTS' IDENTITIES. >> WE WENT ON LOCKDOWN BUT WE HAD TO GO BACK TO OUR CLASSES. THE TEACHERS TRIED TO ESCORT EVERYONE OUT BECAUSE WE WERE ALL BY THE OFFICE WAITING TO GET OUR CLASSES. >> OUR OFFICERS ARRIVED ON-SCENE, WORKED WITH THE SCHOOL STAFF, WERE QUICKLY ABLE TO DETERMINE WHO WAS INVOLVED. THEY ISOLATED THOSE STUDENTS. THEY WERE ABLE TO IDENTIFY ONE STUDENT WHO SUFFERED A VERY MINOR INJURY AS A RESULT OF THE ALTERCATION. MEDICAL WAS PROVIDED AND THAT STUDENT WAS OKAY. >> Reporter: POLICE WERE NOT ABLE TO DETERMINE WHO HAD THE KNIFE OR WHAT THE FIGHT WAS ABOUT. >> AT THIS POINT ALL PARTIES INVOLVED, WE HAVE THEM IDENTIFIED, WE HAVE THEM CONTAINED. NOW WE'RE IN AN INVESTIGATIVE STATE. >> Reporter: AS IT UNFOLDED, INCLUDING A CAMPUS LOCKDOWN, PARENTS BEGAN GETTING TEXTS FROM THEIR KIDS. >> SHE SAID THAT THERE WAS A STABBING. AND THEY'RE STILL TRYING TO FIGURE OUT WHO GOT WHO. THEY'RE ALL ON THE FOOTBALL FIELD RIGHT NOW. >> Reporter: SOME WANTED CLEAR INFORMATION SOONER ABOUT WHAT WAS GOING ON. THE DISTRICT SENT A MESSAGE TO FAMILIES SAYING IN PART, THE SCHOOL WAS UNDER A SECURE CAMPUS ORDER UNTIL ABOUT 12:10 P.M., ADDING THAT STUDENTS WERE SAFE, AND THERE WERE NO OTHER INJURIES OR THREATS. >> SOMEBODY COULD HAVE SAID, HEY, THE KIDS ARE FINE, IT'S JUST AN ACE LATED INCIDENT. >> Reporter: A SPOKESPERSON SAID THEY'RE RE-EXAMINING SECURITY TO DETERMINE WHAT ADD
