Cologne (dpa / lnw) – With a DNA mass test, the Cologne police want to roll up a “cold case” from 1991 again. At that time, a 16-year-old woman from Cologne was raped and strangled. The killer was never caught. Now specialists have secured a new DNA trace of the perpetrator, said a police spokesman on Thursday. Over the coming year, several hundred men who lived or worked near the crime scene at the time are to take a saliva test. So the investigators hope to convict the culprit after all. The “Bild” newspaper had reported on the case.