As Styles was examining the ricochet marks, Alison Cahn was approached by an elderly woman, who led Cahn to a nearby apartment building. There, the woman introduced Cahn to her daughter—Carmen Proetta—who told Cahn that she had witnessed the shooting at the petrol station; although initially reluctant, she was persuaded by Cahn to give her account of the events in an affidavit. Proetta asserted that, immediately before McCann and Farrell were shot, she saw a police car travelling north on Winston Churchill Avenue with its siren activated; as she watched, the police car stopped abruptly and four men—one uniformed police officer and three men in civilian clothes—jumped out. She stated that the three men in plain clothes, all carrying pistols, leapt across the central reservation barrier, at which point she saw McCann and Farrell raise their hands. Proetta believed that all three men then opened fire, while McCann and Farrell had their hands in the air, and that neither suspect made any movements towards their clothing or Farrell's handbag. She went on to state that she witnessed one of the men crouch over McCann and Farrell while they were on the ground, and continue to shoot them. According to Styles, Proetta's account of the shooting tallied with the bullet marks he examined at the petrol station; he also found her description of the bullets striking the bodies particularly convincing, believing that only somebody who had witnessed such an event would be able to describe it so vividly. The journalists also discovered that Proetta's account of the soldiers arriving in a police car matched some of the newspaper reports from the day after the shootings.