 Thrill seekers sprinting through the streets of a small Spanish city this week in the running of the bulls, which kicked off Sunday. Each year, tourists descend on Pamplona for the daily encierro, or bull runs. At 8 o'clock each morning, hundreds dressed in red and white try to outrace six bulls set loose over a half-mile course. Six people, including a man from New York, were injured on the festival's first day. Animal rights activists are campaigning against the event, but it remains popular, drawing more than a million people to Pamplona each year.