Four teens charged over NSW school fire

Four teenaged boys have been charged over a fire at a high school on the NSW mid-north coast that caused $2.5 million in damage.

Several rooms at Melville High School in South Kempsey went up in flames at the end of January.

Two large classrooms and a staff room were completely destroyed.

Three 14-year-olds and a 15-year-old have been charged by police.