A man is in a critical condition in hospital after police restrained him when they were called to reports of him "setting fire to himself".
A probe has now been launched into the incident, which saw the man in his 50s lose consciousness in Camden, north London.
Metropolitan Police were called to reports of a man "behaving erratically, threatening members of the public and setting fire to his clothing" and, after he was detained under the Mental Health Act, the man was taken to a medical facility.
