Karen Shearon said she was going to blow up Susan Wagner HS, sources said.
A 15-year-old student had his jaw broken after the coach did not intervene, the suit says.
The city announced an addition to Susan Wagner High School, with several performing arts facilities.
George Washington High School is housing dozens of people who were homeless before the hurricane.
As staff and students prepare for Monday, many schools are without power or are hosting evacuees.
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