British police have contacted Australian authorities about a possible investigation into a radio station’s hoax call to a hospital about the Duchess of Cambridge, they said Sunday, as the company that owns the station promised it is reviewing its broadcast practices. The prank took a dark twist Friday with the death of nurse Jacintha Saldanha, a 46-year-old mother of two, three days after she unwittingly accepted the call about the health of Prince William’s pregnant wife, Kate. The death has sparked an angry backlash from those who argue the Australian DJs who carried out the hoax should be held responsible. The board of Southern Cross Austereo had an emergency meeting Sunday to discuss a harsh letter from the hospital that fell for the call. King Edward VII’s Hospital, where the former Kate Middleton was being treated for acute morning sickness last week, condemned the ‘‘truly appalling’’ hoax and called the consequences ‘‘tragic beyond words.’’ Max Moore-Wilton, the chairman of 2DayFM owner Southern Cross Austereo, said in a letter to the hospital’s chairman Sunday that the company will cooperate with any investigation.