Eight Los Angeles police officers violated Police Department policy when they fired on two unarmed women in a pickup truck last February during the hunt for Christopher Dorner, the former Los Angeles police officer accused of killing four people, a civilian oversight board said Tuesday. Police Chief Charlie Beck will determine how to discipline the eight, who have been removed from field duty since the episode. Chief Beck said actions could range “from extensive retraining to termination.” The women were delivering newspapers when officers mistook their truck for Mr. Dorner’s vehicle, and fired more than 100 rounds. Last year the city agreed to pay them $4.2 million. Chief Beck said that although he sympathized with the officers, he could not excuse their decision to open fire. “This was a tragic cascade of circumstance that led to an inaccurate conclusion by the officers,” he said.