Police have found forensic evidence at the scene of serious sex assault on a woman at knifepoint, a senior officer said today.Superintendent Nicholas Pedro revealed that “a number of forensic items” had been detected at the scene of the attack on Fairylands Road, Pembroke.He said that businesses and residents in the Pembroke area had turned over CCTV footage to the police with CCTV from the time of the attack to help police identify the assailant.Mr Pedro added: “We have been working