reporter walter morris has the story. >> their time is up. >> reporter: as members of the park land communitytinue to call for change and prepare for their march on washington. >> we're not going to stop and this is just the beginning. >> reporter: three students at stoneman douglas high school are -- >> earlier today we had three incidents on campus that required law enforcement intervention. due to student privacy laws i cannot disclose the details of these incidents, however in all three cases the individuals involved received the appropriate consequences through the juvenile justice testimony and the district's code of conduct. >> justin sal ter arrested tuesday morning, police say the 18-year-old pulled a two-inch knife. >> there's people coming in with pep r weapons and i'm shocked. >> reporter: and about a half hour later, bso called back to the school at 10:00 a.m., this time a 10th grader had made threats to another student. he was eventually taken in for psych yachtic evaluation. >> after what we have all been through, it doesn't make any sense at all. >> reporter: and just after sc