Oakland's McClymonds High School safe to return to, months after chemical scare, district says
"Apparently, it was plastic vessel that over pressurized and burned. That's what caused the black smoke. At this point, because it is an unknown chemical, we are standing by to verify if it is potentially toxic. But in the fire service, we treat all unknown chemicals as potentially toxic," Deputy Chief Zoraida Diaz said at 9:00a.m.
As of 11:00a.m., the fire department was still taking air readings and trying to figure out how to open the room where the fire happened.
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