Jac Casson from NASUWT claimed pupils of all ages had been involved in the violence at Lily Lane.
“Whether that’s punching, kicking, pinching, spitting, biting and also throwing things – trashing classrooms – running outside of classrooms… it’s just anything and everything,” Casson said.
“There is a nursery here and it goes all the way up to year six – these kind of behaviours are being displayed all the way through.
“Pupils are being traumatised by what’s going on around them, frightened of coming to school, hiding behind their own teachers and support staff.”
The Changing Lives in Collaboration (CLiC) Trust that runs Lily Lane has said: “Only together can all parties deliver what is right and in the best interests of the school.
“The safety and wellbeing of pupils and staff is of the very highest priority to us.
“We also support our schools to ensure the needs of all pupils are met, including those with special educational needs”.
NASUWT, the teacher’s union, said strike action at both Lily Lane and St Cuthbert’s is planned for 24-26 February, 3-5 March and 10-12 March.
Strike action will continue at Lily Lane on 17 – 19 March.