(Portland, OR) -- An independent review finds the Portland Police Bureau needs to give officers better training to help domestic violence victims. The City Auditor's Independent Police Review released a report yesterday reviewing the effectiveness of the police bureau's Special Victims Unit. The report says officers responding to initial calls in domestic violence cases need more trauma-informed training to help them understand how trauma affects a survivor's behavior. That includes teaching officers why sexual assault survivors often don't flee, cry out or fight back against their attackers and why survivors might refuse help, lie to police or choose to stay with their abuser. The review also found that the Special Victims Unit benefits from its co-location and collaboration with partner agencies such as the Multnomah County's Domestic Violence Enhanced Response Team. Partner agencies interviewed said the unit should remain in its current location in order to continue facilitating that collaboration.