This brought me back to my copy of Frank Edwards' 'Stranger Than Science' - copyright 1959 - and one of the first collections of paranormal stories that I ever read. There is a chapter called Invisible Fangs that relates a similar incident that occurred in 1951 in Manila, capital of the Philippines. An hysterical girl was brought into the police station with bite marks all over her arms, shoulders and neck. The neck was clearly a location where the bites could not have been self-inflicted. According to witnesses - including the Mayor, Medical Examiner and Chief of Police - the attacks continued while she was in custody, both in her cell and in front of others. Initially, rational explanations such as epilepsy or drug abuse were considered as the most likely cause. These were rational witnesses. However, as the attacks continued, they began to suspect that there was something going on that defied an ordinary explanation. In any case, once the girl was finally transported to a hospital, the attacks ceased and never returned. The case has never been solved.