EPA officials say that more than 1/4 cup of mercury was found inside the school.
EPA inspectors continue to check school items for traces of mercury.
The EPA and Clark County School officials now admit the mercury may have been in the building longer than first reported.
EPA officials are saying upwards of a 1/4 cup of mercury has been found inside Walter Johnson Junior High School so far. They are calling these levels .
When will classes resume?
