Police in Germany are hunting five men of African appearance who lured a nurse into a park with fake cries for help then beat her unconscious and sexually abused her. Officers in the German city of Hamburg are appealing for witnesses following the brutal attack on the female hospital worker, who was unconscious for so long that she developed hypothermia.  The 28-year-old was walking to her car from work at the nearby Asklepios hospital when she apparently heard cries for help coming from a nearby park.  But when she rushed into the dark space to offer assistance she was set upon by five men and was beaten unconscious and mugged.  Police said there was also evidence that the gang had sexually abused their victim, and that they were not talking German to one another during the attack.  There…