Staff connected to colonia high school saying they had been diagnosed with primary brain tumors, about half were cancerous. the cases spanning three decades. right now it s just a list of names and ages and years graduated. so it s not scientific by any stretch. but it s alarming because there s just so many people with either a tumor, malignant or benign. and it s serious. we have to really take a look at it. reporter: the mayor of woodbridge telling our station wabc environmental experts are testing the area for radiation. placing canisters inside every room in the school to collect air samples. the other step is, they are doing a test of the ground with gamma meters and they put them in strollers. they literally wheel the strollers across every square inch of the outside of the school. reporter: some students are justifiably concerned. everyone s praying, hoping for the best. but i guess only time will tell. reporter: tonight, medical experts are urging caution. it s c