A mother whose daughter required hospital treatment after an alleged chemical attack at Beaverwood School has denounced the school's handling of the situation.
Kerry Finch, 30, of Mottingham Road, said the Chislehurst school failed to inform her about Tuesday's incident until hours after it had happened.
She added they failed to take her daughter, Paris, whose "whole face was completely burned", to hospital.
She told News Shopper: "The school neglected to call for three hours after my daughter’s face had been burned.
"I jumped in my car and went down there.
"When I got there her whole face was completely burned, her cheeks were blistered.
"The teachers neglected their duties.
"They had no right to delay my daughter's treatment for three hours. Maybe then she wouldn't have blistered on the cheeks.
"She was left in a room with a tissue. They didn't even put the burn under cold water.
“Everyone knows that is what you do with a burn, especially a substance that you didn't know what it was.
"I was in shock that they did this to my daughter."
Mrs Finch immediately took her daughter to Queen Mary's Hospital.
Two girls have been arrested on suspicion of possessing a prohibited weapon following the alleged attack.
Bromley police have said two females, aged 13 and 14, have been bailed until April 25.
Beaverwood School headteacher Karen Raven said: "Beaverwood School For Girls is proud of the calm and sensible way in which the isolated incident was dealt with by students and staff.
"It is business as usual for the school community as exams are underway.
"At break time, a teenager randomly sprayed a can, the contents of which accidentally caught some of her friends.
"Only one student was treated in hospital. No other students were involved.
"The school continues to take all appropriate actions."