A teachers union has filed state labor relations charges over a plan to turn around one of Rhode Island's worst-performing high schools by firing the entire faculty.

The Central Falls Teachers' Union filed the complaint Monday. It says the firings were an unfair labor practice and accuses the school district of failing to bargain and not providing the teachers with enough information.

The board of trustees for the Central Falls district voted last week to fire more than 90 teachers and other staff members by year's end from the city's high school. No more than half of the staff could be hired back under federal rules.

President Barack Obama cited the firings in a speech Monday as an example of how there needs to be accountability for poor student performance.