Police have found forensic evidence at the scene of a serious sex assault on a woman at knifepoint, a senior officer said yesterday.Detective 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 to police CCTV footage from Sunday morning to help police identify the assailant.Mr Pedro added: “We have been working with