UK Metropolitan Police are searching for an adult male suspect accused of launching an acid attack on minor students outside a school in Westminster on Monday, Sept. 30. The unidentified suspect, described as a tall, slim, black male, was wearing dark clothing with his face obscured behind a mask or balaclava at the time of the attack, police said.

Two minor students, a 16-year-old boy and a 14-year-old girl, sustained significant injuries and were transported to the hospital, where they remain. A teacher who provided aid to the victims was injured in the process but has since been released from the hospital.

The female student’s injuries are being treated as life-changing, while the boy sustained less severe injuries, authorities said.