Oxford Street is Britain's busiest street, and black Friday is one of its busiest days. Nightmares seemed to be coming true this past Friday, November 24, when what sounded like gunshots sent the crowd running for cover. Many assumed the worst: a terror attack. Nearby buildings immediately flooded with pedestrians. Though authorities eventually declared the incident a false alarm, customers' fears were real as police told them to take cover and remain inside shops for their own safety.