ANYONE WITH INFORMATION ABOUT HIM. >>> STUDENTS WERE BACK IN CLASS AT CARMALT ELEMENTARY, ONE DAY AFTER A MASKED MAN WAS SPOTTED INSIDE THE BUILDING. >> SOME PARENTS TOLD MAMIE BAH THAT THEY NEED MORE ANSWERS. >> WHAT IS GOING TO HAPPEN ON MONDAY, WHERE THE -- WERE -- IT >> Reporter: I AM FEELING OKAY, A LITTLE BIT OVERWHELMED. SOME PARENTS GAVE THEIR CHILDREN THE DAY OFF, THEY SHOWED UP TO PICK UP THEIR BACKPACKS. WHEN THE CHILDREN WERE BUSSED TO THE BROOKLINE REC CENTER, YESTERDAY, THEY HAD TO LEAVE ALL OF THEIR BELONGINGS BEHIND. THURSDAY MORNING, THERE WERE REPORTS OF THE UNKNOWN MASK MAN THAT UPENDED THE SCHOOL DAY. POLICE OFFICERS SURROUNDED THE BUILDING AND BEGAN SEARCHING AND THEY FOUND NOTHING. >> I THINK THEY DID A VERY GOOD JOB, AS FAR AS MAKING SURE THAT THE KIDS GOT OUT OF THE BUILDING SAFELY, ET CETERA. >> Reporter: TODAY, THE BUILDING OPERATED UNDER SECURED MODE, NO ONE ALLOWED TO ENTER WITHOUT A PRESCHEDULED APPOINTMENT. AS FAR AS MONDAY, IT IS UNCLEAR WHAT THE PLAN IS. UNLIKE MOST SCHOOLS IN THE PITTSBURGH PUBLIC SCHOOL DISTRICT , THIS ONE DOES NOT HAVE A SECURITY GUARD TO CHECK-IN VISITORS. >> I THINK THEY SHOULD DEFINITELY TAKE THAT MEASUREMENT AND TRY TO GET SOMEBODY IN THERE. INVESTIGATORS THOUGHT THAT CAMERAS CAPTURED THE MAN, BUT THEY DID NOT. IT IS UNCLEAR HOW HE GOT INTO THE BUILDING. I AM TOLD THEY DO NOT BELIEVE HE WAS ARMED. ONE GRANDFATHER SAID THAT THERE SHOULD BE MORE CAMERAS AROUND THE SCHOOL. >> THE SCHOOL NEEDS CAMERAS IN EVERY ROOM. EVERY ROOM. OUTSIDE, YOU PUT ENOUGH CAMERAS IN THERE, YOU WILL KNOW WHERE HE WENT,