at a local junior high are much larger than thought. traces of the mercury are found forcing one family forced out of their home. and we re joined live at classes in buffalo where classes will be canceled for three straight reporter: the epa tells us there is considered a large amount of mercury. the epa found about one-fourth cup inside of the school. the mercury spill in a gym class sends johnson junior high it was linked to three homes and one home was deemed unsafe. more than 30 staff members and students were screened. we were told that a small amount was found. the amount that we were dealing with was consistent with that of an old school thermomemeter. not only did they put my child at risk, they put 1,400 students at risk. parents like nicole had frustrated showing that children epa. reporter: it s the school district s job to get to the bottom of where it came from. we knows as a school they we can do better for the teachers and the students. and