Investigators say a doctor who was arrested in Berlin in August is now suspected of killing eight patients and in some cases trying to cover up the evidence by setting fires

"The accused appears to have had no motive for killing the people other than the act of killing itself," prosecutors said.

Berlin prosecutors suspect a doctor who was responsible for palliative care in patients' homes of as many as eight murders. The German doctor allegedly acted out of ‘the desire to kill’, according to the prosecution.